[Music] [Music] this is the story of the greatest scientific discovery ever the discovery that everything is made of atoms the vast variety and richness of everything we see around us in the world and beyond how it's built up how it all fits together is all down to atoms and the mysterious laws they obey as scientists delve deep into the atom it's the very part of matter they unraveled nature's most shocking secrets they had to abandon everything they believed in and create a whole new science a science that today underpins the whole of physics chemistry biology and maybe even life itself but for me the story of how humanity solved the mystery of the atom is both inspiring and remarkable it's a story of great geniuses of men and women driven by their thirst for knowledge and glory it's a story of false starts and conflicts of ambition and revelation a story that leads us through some of the most exciting and exhilarating ideas ever conceived of by the human race and for a working physicist like me it's the most important story there is [Music] [Music] on the 5th of October 1906 in a hotel room near Trieste a German science is called Ludwig Boltzmann hanged himself Boltzmann had a long history of psychological problems and one of the key factors in his depression was that he'd been vilified even ostracized for believing something that today we take for granted he believed that matter cannot be infinitely divisible into ever smaller pieces instead he argued that ultimately everything is made of basic building blocks atoms it seems incredible now that Boltzmann's revelation was so controversial but a hundred years ago arguing atoms were real was considered by most to be a waste of time although philosophers since the Greeks had speculated that the world might be made out of some kind of basic unit of matter they realized that they were far too small to see even under the most powerful microscopes speculating about them was therefore a complete waste of time but then in the middle of the 19th century whether or not the atom was real was suddenly a question of burning importance the reason was this steam by the 1850s it was changing the world it powered the mighty engines the trains the ships the factories of the Industrial Revolution so figuring out how to use it more effectively became a matter of crucial commercial political and military significance not surprisingly then it became the key question of 1965 [Music] the demand to build more powerful and efficient steam engines in turn created an urgent need to understand and predict the behavior of water and steam at high temperatures and pressures not the alts Minh and his scientific allies showed that if you imagine steam is made of millions of tiny rigid spheres atoms then you can create some powerful mathematical equations and those equations are capable of predicting the behavior esteemed with incredible accuracy but these same equations plunge Boltzmann and his fellow atomists into controversy their enemies argued that since the atoms referred to in their calculations were invisible they were merely a mathematical convenience rather than real physical objects to claim that imaginary entities were real seem presumptuous even blasphemous you see boss most critics argued that it was sacrilegious to reduce God's miraculous creation down to a series of collisions between tiny inanimate spheres Boltzmann was condemned as an irreligious materialist the tragic irony of Boltzmann's story is that when he took his own life in 1906 he was unaware that he'd been vindicated you see a year before he died a young scientist had published a paper which undeniably irrefutable proclaimed the reality of the atom you might have heard of this young scientist his name was Albert Einstein in 1905 the year before Boltzmann suicide Albert Einstein was 26 years old his brash arrogance had upset most of his professors and teachers and he was barely employable then he got his girlfriend pregnant that was followed by a hasty marriage he needed a job any job having not quite distinguished himself a university he took up a job as a patent clerk here in bern in switzerland he'd moved into the small one-bedroom Apartments on cram gasser with his young wife from a laborer despite dire personal straits the young Einstein had a burning ambition he was desperate to make his mark as a physicist and in 1905 during one miraculous year the mark he made was truly incredible having an undemanding job meant that young einstein had plenty of time on his hands both at work and here in his tiny apartment to think deep thoughts in the space of just a few months he was to publish several papers that would change science forever now everyone's heard of his theory of relativity even if they don't understand it and his paper on the nature of light was to win him the Nobel Prize a few years later but ironically it wasn't either of these two papers that had the most impact on the discovery of atoms the one that made all the difference was a short paper on how tiny grains of pollen danced in water almost 80 years earlier in 1827 a Scottish botanist called Robert Brown sprinkled pollen grains in some water and examined it through a microscope what he found was really strange because instead of the pollen grains floating gently in the water they danced around furiously almost as though they were alive now while this so called Brownian motion was strange scientists soon forgot about it they found it mundane even boring I mean who cared if the pollen giggled about in the water and what had the jiggling to do with atoms anyway for nearly 80 years brown's discovery remained a little-known scientific anomaly then Einstein changed everything in one staggering insight I Stein saw that Brownian motion was all about atoms in fact he realized that the jiggling of pollen grains in water could settle the raging debate about the reality of atoms forever his argument was simple the pollen will only jiggle if they were being jostled by something else so I said that the water must be made of tiny atoms like particles which themselves are jiggling and are continually buffeting the pollen if there were no atoms then the pollen would stay still so Boltzmann and his contemporaries had been rowing furiously about this question for nothing the answer was there all along Einstein proved that for Brownian motion to happen atoms must exist Einstein später went way beyond just verbal arguments with flawless mathematics he proved that the dance of the pollen revealed the size of the atom and it's mind-numbing ly tiny 1/10 of a millionth of a millimeter across a single human hair itself one of the narrowest things visible to the naked eye is over a million atoms wide let me put it another way there are more atoms in a single glass of water than there are glasses of water in all the oceans of the world sort of hurts your head just to think about it Einstein's paper ended the debate about whether the atom was real or not and Boltzmann had been totally vindicated the atom had to be real [Music] [Music] by the early years of the 20th century the atom had arrived scientists we'd argued that the atom was real were no longer heretics in a dramatic sudden reversal they became the new orthodoxy but they were to pay a huge price for their success before that even had a chance to congratulate each other on discovering the atom it ripped the rug out from under their feet and sent them spiraling into a bizarre and at times terrifying new world and it all kicked off here in what by 1910 was the world center for atomic physics Manchester two of the most extraordinary men in the history of science worked here in the physics departments of Manchester University between 1911 and 1916 they were Ernest Rutherford and Niels Bohr on the face of it two very different personalities and the unlikeliest of collaborators Rutherford was from a remote part of New Zealand and grew up on a farm Bohr was born in Copenhagen wealthy and erudite virtually an aristocrat Rutherford was the ultimate experimentalist he loved technology and ingenious arrangements of batteries coils magnets and radioactive rocks but he was also blessed with a profound intuition in contrast war was the ultimate theoretician to him science was about deep thought and abstract mathematics pen and paper chalk and blackboard were his tools logic was his path to truth although their approaches to their work couldn't have been any more different they had one thing in common they were prepared to ditch three centuries of scientific convention if it didn't fit what they believed to be true they were genuine revolutionaries Rutherford and Bohr were two of the most extraordinary minds ever produced by the human race but it would take every bit of their dogged tenacity and inspirational brilliance to take on the atom in 1907 ernest rutherford took over the physics departments in manchester this was a period of momentous scientific change just over ten years earlier in germany came the first demonstration of weird rays that see through flesh to reveal our bones these rays were so inexplicable scientists didn't know what to call them so they were named x-rays and a couple of years after that in Cambridge it was shown that powerful electric currents could produce strange streams of tiny glowing charged particles that were called electrons and in 1896 in Paris came the most significant discovery of all one that more than any other would unlock the secrets of the atom the metal uranium was shown to emit a strange and powerful energy that was named radioactivity it seemed straight out of science fiction radioactive metals were warm to touch they could even burn the skin and the rays could pass through solid matter as if it wasn't there it truly was a marvel of the modern age Rutherford was obsessed with radioactivity all sorts of questions plagued him how has it made why did it come in different forms how far could it travel through a vacuum or through air did it alter the materials that are encountered in Manchester together with his assistants hands Geiger of Geiger counter fame and Ernest Marsden he devised a series of experiments that would probe the Enigma of radioactivity 1909 Manchester University these are the props goldleaf Beaton said it's just a few atoms thick a movable phosphorescent screen that flashed when struck by radioactive rays and inside this box is the star attraction a tiny piece of the metal radium radium is an extraordinarily powerful source of a kind of radioactivity the Rutherford had named alpha rays they weren't really rays they were more like a steady stream of particles and radium spat up these particles like a machine gun that never ran out of bullets Rutherford set his students a simple enough task use the radium gun shoot the alpha radioactivity at the gold leaf and with the phosphorescent plate count the number of particles that come out the other side in practice that meant sitting alone in the dark and counting tiny almost invisible flashes on the phosphorescent screen it was deeply tedious but Rutherford insisted that they keep at it weeks passed and the team of researchers found nothing unusual the alpha particles seemed to punch through the gold almost as though it wasn't there very occasionally they would swerve slightly as they went through hardly front-page news now comes what must be the most consequential off-the-cuff remark in the history of science one that changed the world the story goes that Rutherford bumps into his assistant Geiger in the corridor outside the lab Geiger reported that so far they've seen nothing unusual now in response Rutherford could have easily just nodded and walked on but he didn't he later claimed that he said what he said at the time for the sheer hell of it but I don't believe him Rutherford had great scientific intuition and I think he had a hunch that something was about to happen here's what he said to Geiger tell young Marsden to go back and see if he can detect any alpha particles on the same side of the gold leaf as the radium source in other words see if any alpha particles are bouncing back now it's an extraordinary suggestion from Rutherford and one day he had no logical reason to make after all Geiger Marsden had spent weeks seeing alpha particles do nothing but streams straight through the gold leaf almost as though it wasn't there why would any bounce back the Geiger Marsden were young and in all the big New Zealand er they did their master's bidding and went back into their dark lab and watched patiently for days they saw absolutely nothing they strained their eyes to the points of myopia but didn't see a single alpha particle bouncing back off the gold it seemed that rather for suggestion really was a stupid one but then the impossible happened one afternoon in 1909 Geiger burst into Rutherford's office with some astonishing news very very occasionally an alpha particle would indeed ricochet back off the gold leaf Geiger calculated that only 1 in 8,000 alpha particles would do this it's a tiny percentage but Rutherford's mind reeled with the news he would later say it was like firing a shell at a piece of tissue paper and have it bounce back at you there and then Rutherford knew he'd struck physics cold although it would take him over a year to fully understand why the alpha particles would do this when he did he would show humanity for the first time the inside of an atom now people had barely got used to the idea that atoms existed but now Rutherford knew that this my new world 1/10 of a millionth of a millimetre across had his own internal structure within the atomic there's a sub atomic world and Ernest Rutherford believed he knew what it looked like Rutherford realized that the bouncing alpha particle revealed an atom that was totally unexpected it had no familiar analogy on earth so Rutherford looked for one in the heavens he pictured the atom as a tiny solar system electrons tiny particles of negative electricity orbit around a minut positively charged object called the nucleus [Music] Rutherford calculated that the nucleus was 10,000 times smaller than the atom itself that's why only 1 in 8,000 alpha particles bounce back they're the ones that hit the Tony nucleus by chance the rest whizzed by without hitting anything the first astonishing consequence of this idea is that Rutherford's atom is almost entirely empty space that's why nearly all the alpha particles race through the gold atoms as if there's nothing there there really is nothing there consider the bizarre implications of Rutherford's atom by imagining it on a bigger scale if the nucleus were the size of a football then the nearest electron will be an orbit half a mile away the rest of the atom will be completely empty space let me explain another way if you were to suck out all the empty space from every atom in my body then I would shrink down to a size smaller than a grain of salt of course I'd still weigh the same and if you did the same thing to the entire human race then all 6 billion of us would fit inside a single Apple the atom was unlike anything we had ever encountered before and it would only get stranger and stranger almost immediately a problem surfaced and it was a big one according to the tried and trusted science of the time the electrons should lose their energy run out of speed and spiral into the nucleus in less than a blink of an eye Rutherford's atom contradicted the known laws of science the atom didn't care that it defied scientific convention it's almost entirely empty space and it's gonna stay that way I show no signs of shrinking down to the size of a grain of salt and the earth is well the size of the earth it's not getting smaller not surprisingly all the established scientists of the day including Einstein were battled scientific ideas they put their faith in all their lives had failed completely to explain the atom the atom now required a new generation of scientists to follow in Rutherford's footsteps bold brilliant and above all young it was crucial they had no loyalty or attachment to ideas held by previous generations one of the first of this new breed was niels bohr he sailed from Denmark in 1911 and made his way it's English soil having finished his studies in Copenhagen war decided to move abroad and be at the center of the new physics the trail led you to britain manchester university ernest rutherford or made it his mission to solve the puzzles of why the atom didn't collapse and why there was so much empty space as one of the new breed of theoretical physicists he was fearless in his thinking and was prepared to abandon common sense and human intuition to find an explanation so in a leap of genius he started to look for clues about the atoms structure not by looking at matter but by examining the mysterious and wonderful nature of light our atoms and lights are clearly connected most substances glow when they're heated and for centuries people had realized that different substances glow with their own distinctive colors a bit like a signature so the green of copper the yellow of sodium and the red of lithium these colors associated with different substances are called spectra and Bohr's great insights was to realize that spectra are telling us something about the inner structure of the atom that they could explain all that empty space Bohr's idea was to take Rutherford's solar system model of the atom and replace it with something that's almost impossible to imagine or visualize so sensible ideas like empty space and particles moving around in orbits fade away and they're replaced with something that is one of the most misunderstood and misused concepts in the whole of science the quantum jump now it takes most working physicists many years to come to terms with quantum jumps and in fact or himself said that if you think you've understood it then you haven't really thought about it enough so I'm going to take a deep breath and under 30 seconds try and explain to you one of the most complicated concepts in the whole of science but one that underpins the entire universe Bohr described the atom not as a solar system but as a multi-story building the ground floors where the nucleus lives were the electrons occupying the floors above mysterious laws mean the electrons can only live on the floors never in between and other mysterious laws mean that sometimes that can instantaneously jump from one film to another these are what we call quantum jumps now Bohr had absolutely no idea what these laws were but thinking like this allowed him to make a startling prediction when an electron jumps from a higher floor to a lower one it gives off light more significantly the color of the light depends on how big or small the quantum jump the electron makes so an electron jumping from the third floor to the second floor might give off red light when an electron jumping from the tenth floor to the second floor blue light to test his new theory Bohr used it to make a prediction could it explain the mysterious signature in the spectrum of hydrogen after months of calculating furiously who finally came up with the results and his prediction was surprisingly accurate for the first time ever it looked like the spectrum can be explained back in 1913 that was big news but Bohr's new idea rested on a single seriously controversial supposition why should the electrons in the atom behave as though they were in a multi-story building and why should they magically perform quantum jumps from one story to another there was no precedent for it anywhere else in science when one physicists claimed the jumps were nonsense Moore replied yes you're completely right but that doesn't prove the jumps don't happen only that you cannot visualize them but not being able to visualize things seem to go against the whole purpose of science all the scientists in particular felt that science was supposed to be about understanding the world not about making up arbitrary rules that seemed to fit the data conflict between the two generations of scientists was inevitable cause weird new Adam and his crazy quantum jumps were a shot across the bow silence and the old school reacted and leading the traditionalists was giant of the physics world Albert Einstein he hated all his ideas and he was going to fight them anything from a sexual assault on Nats [Music] borther is undeterred and as the 1920s gone the battery needs for one of the greatest conflicts in all science Woodlawn so far the debates about the new atomic physics had been polite from gentlemen now the two sides wheeled out their biggest guns two of the greatest names in physics they were two very true trusting characters on those dicho for the new revolutionary science was a buttoned-up uber competitive German called Verner Heisenberg for the Conservatives as a debonair byron esque Austrian called Owen Schrodinger [Music] [Applause] Oh in Schrodinger passionate and poetic a philosopher and a romantic he wrote books on the ancient Greeks on philosophy on religion he was influenced by Hinduism there's also a very flamboyant character cool suave sophisticated a dapper dresser and a big hit with the ladies [Music] [Applause] schrödinger's promiscuity was legendary he had a string of girlfriends throughout his married life some of them much younger than him in 1925 38 year-old Schrodinger stayed at the Alpine resort of yoson Switzerland for a secret liaison with an old girlfriend whose identity remains a mystery to this day but their passion proved to be the catalyst but Schrodinger's creative genius another physicist said of Schrodinger's week of sexually inspired physics he had two tasks that week satisfy a woman and solved the riddle of the atom fortunately he was up to both he took de Bru's idea of mysterious pilot waves guiding electrons around an atom one crucial step further he argued that the electron actually was a wave of energy vibrating so fast it looked like a cloud around the atom a cloud like wave of pure energy and what's more he came up with a powerful new equation which completely described this way and so described the whole atom in terms of traditional physics the equation he came up with we now call schrödinger's wave equation it's incredibly powerful what's unique about it is that it features a new quantity called the wave function which Schrodinger claimed completely describe the behavior on the subatomic world [Music] Schrodinger's equation and the picture of the Atome painted created during a sexually charged holiday in the Swiss Alps once again allowed scientists to visualize the atom in simple terms it's hard to overestimate the relief Schrodinger's idea brought to the traditional physics community strange though his picture of the Aten was at least it was a picture and scientists love pictures they allowed them to use their intuition but there was still a deep nagging problem one that the radicals felt Schrodinger just couldn't reconcile his new theory still couldn't account for balls strange instantaneous quantum jumps the time had come for the radicals to hit back [Applause] in the summer of the same year one of Niels Bohr's protegees Verner Heisenberg was travelling to an obscure island of the north coast of Germany he was fiercely competitive and took Schrodinger's ideas as a personal affront he felt strongly that the strangeness of the instant quantum jumps was actually the key to understanding the atom he thought the atom was so unique and unusual it shouldn't be compromised through a simple analogy like a wave or an orbit or even a multi-story building he believed it was time to give up any picture of the atom at all Verner Heisenberg while the true geniuses of the 20th century young athletic a great mountain climber an excellent pianist he was also an exceptional student at the age of just 20 who was well on his way to finishing his ph.d and being courted by the great universities across Europe now in the summer of 1925 he was suffering from a particularly bad bout of hay fever his face was swollen up almost beyond recognition he decided to escape alone here to this beautiful but isolated island of helgeland he walked along the beaches he swam he climbed the rock and he pondered ever since he'd encountered atomic physics Heisenberg felt in his bones that all human attempts to visualize the atom to model it with familiar images would always fail the atom he believed was too capricious too strange to ever be explained that simply so he decided to abandon all pictures of it and describe it using pure mathematics alone but as he pondered he realized that the atom didn't just defy visualization it even defied traditional mathematics it was while he was here on helgeland the Heisenberg had an incredible revelation he realized that in order to describe certain properties of atoms he had to use a strange new type of mathematics it seems that certain properties like where an electron is at a given time and how fast it's moving where multiplied together the order in which you multiply there matters let me try and explain if we multiply two numbers together it doesn't matter which or do we do it in so 3 times 4 is clearly the same as 4 times 3 but when it came to atoms Heisenberg realized that the order in which he multiplied quantities together gave a different answer this quickly led him to other discoveries and he was convinced that he'd cracked a code in the atom that he'd somehow found the hidden mathematics within he was so excited he was also very scared that night he climbed to the top of a rock and sat there waiting till dawn he called it his night of helgeland when he returned to his University in getting and he told his colleague Max Born about it and they then worked together intensely for several months developing a whole new theory of the atom a theory that today we call matrix mechanics [Music] matrix mechanics uses complex arrays of numbers rather like a spreadsheet by manipulating these arrays Heisenberg and his mentor the brilliant physicist max all could accurately predict atomic behavior but from Einstein and the traditionalists this was pure scientific heresy an atom can't actually be a matrix of numbers surely we made of atoms not numbers back in Copenhagen Bohr and Paulie were thrilled with matrix mechanics so what if we couldn't imagine the atom as a physical object they exalted in the purity of the mathematics and launched into vicious attacks against Schrodinger's vulgar sensual waves Heisenberg wrote the more I reflect on the physical portion of Schrodinger's equation the more disgusting I find it in fact it's just [ __ ] but Schrodinger was equally scathing of Heisenberg saying he was repelled by his methods and found his mathematics monstrous in Munich in 1926 their enmity began to reach boiling points Schrodinger was to give a lecture on his wave equation Heisenberg scraped together the money to travel down to Munich for the lecture to finally come face to face with his rival what was at stake was more than just Heisenberg's reputation he believed Schrodinger's simplistic approach wasn't just misguided but totally wrong and his intention was nothing less than to destroy Schrodinger's theory Schrodinger delivers his lecture on the new wave mechanics to a packed audience the standing-room-only he writes down his new wave equation to Schrodinger this describes a real physical picture of the atom with electrons as waves surrounding the atomic nucleus 24-year old Verna Heisenberg is in the audience it can hardly contain himself at the end of the lecture he stands up and delivers a monologue attacking Schrodinger's approach for Heisenberg it's impossible to ever have a picture of what the atom is really like the audience is on Schrodinger side they'd much prefer his simple physical interpretation to Heisenberg's abstract complicated mathematics Heisenberg is booed he's told to sit down and be quiet he leaves the lecture sad and depressed Heisenberg returned to Copenhagen with his confidence severely dented there at the Institute he and Bohr reached their darkest moment almost all of the scientific community was against them they felt isolated desperate their backs were against the wall despite this they stubbornly refused to give up their controversial theory this attic room was Heisenberg study back in 1926 Bohr would come up here night after night we're here in Heisenberg would argue about the meaning of the new quantum mechanics they would argue so passionately but on one occasion apparently Heisenberg was reduced to tears and then as Heisenberg stared out of his attic window in despair the part below an extraordinary thought occurred to him it struck him why an atom can't be visualized why can't be understood intuitively it's not just because it's tiny tricky and difficult is because it's inherently unknowable he realized that there was a fundamental limit to how much we can know about the subatomic world for instance if we know where an electron is at a particular moment in time then we cannot know how fast it's moving but if we knew its speed we wouldn't know his position this ambiguity isn't a shortcoming in the theory itself nor was it due to the clumsiness of the way we carry out our measurements but a fundamental truth about the way nature behaves at the subatomic scale it became known as Heisenberg's uncertainty principle and is probably the most profound incredible yet unsettling concepts in the whole of science [Music] what Heisenberg had uncovered through his abstract matrix mechanics was a deep and shocking truth about the atomic world atoms are willfully obscure we can never fully know an atoms position and speed simultaneously the atomic world just refuses to allow that to happen it was completely mind-boggling but once they accepted it Heisenberg and Bohr who found the boost of confidence to be even more bold they realized uncertainty forced them to put a paradox right at the very heart of the atom atoms are not just unimaginable they're self-contradictory they behave both like particles and waves and it gets weirder when you're not looking at an atom it behaved like a spread-out wave but when you look to see where it is it behaves like a particle this is insane first atoms couldn't be visualized at all now it seems they change completely in character depending on whether or not you're looking at them the uncertainty principle had changed everything it revealed a shocking contradiction at the heart of nature everything we see is made of atoms and yet atoms themselves are unknowable they can only be understood through mathematics for the first time for Bohr and Heisenberg everything about the atom fell into place by the autumn of 1927 full of confidence and smarting for a fight they knew they were finally ready to take on the Conservatives [Music] for this physics showdown they chose the Solvay conference in Brussels all the world's leading atomic physicists would attend if war and Heisenberg was successful then they would lead a total scientific revolution this is amazing I'm looking at original footage of the Solvay delegates coming out of these doors there's Bohr talking to Schrodinger and and this Heisenberg behind them and there's Paolo Li strange looking guy on there's Einstein coming down with a big smile on his face for the week of the conference all that the delegates could think and talk about was Bohr's quantum mechanics with uncertainty now a central plank it was a truly formidable theory and over the week the final showdown played out between Bohr and his archrival Albert Einstein Einstein hated quantum mechanics and every morning he'd come to war with an argument that he felt picked a hole in the new theory war would go away very disturbed and think very hard about it and by the end of the day he'd come back with a counter argument that dismissed Einstein's criticism and this happened day after day until by the end of the conference Bohr had brushed aside all of Einstein's criticisms and Bohr was regarded as having been victorious and with that his vision play-actor which became known as the Copenhagen interpretation was suddenly at the very heart of atomic physics at the end of the conference they all gather for the team photo never before or since have so many great names of physics being together in one place at the front the elder statesmen of physics Hendrik Lorentz flanked on either side by Madame Curie and Albert Einstein Einsteins looking rather glum because he's lost the argument Louis debris has also failed to convince the delegates of his views victory goes to Niels Bohr he's feeling very pleased with himself next to him one of the unsung heroes of quantum mechanics the German Max Born who developed so much of the mathematics and behind them the two young disciples of Bohr Heisenberg and Pauli Poly's looking rather smugly across at Schrodinger bit like the cat who's got the milk this was the moment in physics when it all changed the old guard was replaced by the new chance of probability became interwoven into the fabric of nature itself and we could no longer describe atoms in terms of simple pictures but only using pure abstract mathematics the Copenhagen view had been victorious although Einstein went to his grave never believed in quantum mechanics solve a 1927 was the turning point at which the rest of the science establishments came to embrace the Copenhagen interpretation and that interpretation is still accepted today all the physics that I use in my research certainly the quantum mechanics that I teach my students and that fills the textbooks on my shelves is based on ideas that were hammered out and crystallized here at the Solvay conference in October 1927 in a sense everything I know about the way the world around me is made up started here the quantum mechanical description of the atom is one of the crowning glories of human creativity over the last of 18 years it has been proven right time after time and it's Authority has never been in doubt it's a monumental scientific achievement between 1905 and 1927 science changed our view of the world it also changed our view of science itself as scientists probed the tiniest building blocks of matter they created the most successful and powerful theory ever quantum mechanics it allows us to describe what everything in the universe is made of how it interacts and how it all fits together but it comes at a huge price at its most fundamental level we have to accept that nature is ruled by chance and probability Heisenberg's uncertainty principle dictates that there are certain limits on the sorts of questions we can ask the atomic world and most crucially while we now know so much more about what an atom is and how it behaves we have to give up any possibility of imagining what it looks like our human nature has forced us to ask questions of everything we see around us in the world what we've discovered has been beyond our wildest imagination [Music]

Absolutely. Your list is very broad, so the best way to study it is not to memorize every disease. We can turn it into a high-yield nursing reviewer based on: What is it? → What will I see? → What should I assess? → What should I do? → What medications/treatments matter? → What is the priority/emergency? → What should I teach? Below is a condensed master reviewer. I’ll keep it nursing-focused and use simple language. ⸻ 🩺 MEDICAL-SURGICAL NURSING REVIEWER 1. ENDOCRINE SYSTEM Diabetes Mellitus Type 1 Type 2 Main problem Little/no insulin Insulin resistance + progressive insulin deficiency Usually Younger onset, but can occur any age More common in adults Treatment Insulin required Lifestyle + oral/injectable meds ± insulin Major acute problems DKA HHS Signs of hyperglycemia “3 Ps” * Polyuria – urinating frequently * Polydipsia – excessive thirst * Polyphagia – excessive hunger Other: * Fatigue * Blurred vision * Slow wound healing * Recurrent infections Hypoglycemia Think FAST: * F – Feeling shaky * A – Altered behaviour/confusion * S – Sweating * T – Tachycardia Treatment if conscious: 15 g fast carbohydrate → recheck glucose in 15 min → repeat if necessary. Examples: * Glucose tablets * Juice * Regular pop If unconscious/severe: * Glucagon if appropriate * IV dextrose in a healthcare setting DKA Usually associated with Type 1. Think: Hyperglycemia + ketones + metabolic acidosis Signs: * Dehydration * Abdominal pain * Nausea/vomiting * Fruity/acetone breath * Kussmaul respirations * Altered LOC Priority treatment: 1. IV fluids 2. Insulin 3. Monitor/correct electrolytes, especially potassium 4. Monitor glucose and acid-base status HHS Usually Type 2. * Extremely high glucose * Severe dehydration * Altered LOC * Little/no significant ketoacidosis Major nursing priority: fluid replacement and monitoring. Diabetes teaching Remember: * Foot care * Inspect feet daily * Proper footwear * Don’t walk barefoot * Don’t cut corns/calluses yourself * Monitor blood glucose * Know signs of hypo/hyperglycemia * Medication adherence * Sick-day management * Regular eye/kidney/foot assessments ⸻ ❤️ 2. CARDIOVASCULAR SYSTEM Stroke Two major types: * Ischemic → blocked blood vessel * Hemorrhagic → bleeding Recognize stroke: BE FAST B – Balance loss E – Eye/vision changes F – Face drooping A – Arm weakness S – Speech difficulty T – Time to call emergency services Nursing priorities * ABCs * Determine last known well * Neurological assessment * Blood glucose * Prepare for CT/imaging * Swallow assessment before oral food/fluids/medications * Prevent aspiration * Maintain safety Do not give food or water until swallowing is assessed. ⸻ Myocardial Infarction (MI) Think: “Time = muscle.” Common symptoms: * Chest pressure/pain * Radiation to arm/jaw/back * Dyspnea * Diaphoresis * Nausea * Anxiety Some patients, especially older adults and people with diabetes, may have atypical or minimal pain. Nursing priorities * ABCs * ECG * Vital signs * Cardiac monitoring * IV access * Blood work including cardiac biomarkers * Oxygen if hypoxemic/clinically indicated * Administer prescribed medications promptly Common medications: * Aspirin * Nitroglycerin * Antiplatelet drugs * Anticoagulants * Beta blockers * Statins Nitroglycerin Can cause: * Hypotension * Headache * Dizziness Never combine nitrates with PDE-5 inhibitors because of potentially severe hypotension. ⸻ Heart Failure Left-sided Think Lungs * Dyspnea * Crackles * Orthopnea * Pulmonary edema * Pink/frothy sputum in severe pulmonary edema Right-sided Think Body * Peripheral edema * Weight gain * JVD * Hepatomegaly * Ascites Nursing priorities * Daily weight * I&O * Respiratory assessment * Edema assessment * Fluid/sodium management as ordered * Medication adherence Sudden weight gain can indicate fluid retention. Common drugs: * Diuretics * ACE inhibitors/ARBs/ARNI * Beta blockers * Mineralocorticoid antagonists * SGLT2 inhibitors * Digoxin in selected patients Digoxin Watch for: * Bradycardia * Nausea/vomiting * Visual disturbances * Dysrhythmias Low potassium increases risk of digoxin toxicity. ⸻ Peripheral Vascular Disease Arterial Think: “Pain + Pale + Pulseless + Cold” * Cool extremity * Weak pulses * Pale colour * Pain with activity * Poor wound healing Venous Think: “Swollen + Warm + Edema” * Edema * Warm skin * Aching * Venous ulcers often near ankles ⸻ 🩸 3. HEMATOLOGY Anemia Reduced oxygen-carrying capacity. Signs: * Fatigue * Pallor * Weakness * Dyspnea * Tachycardia * Dizziness Iron-deficiency anemia May see: * Low hemoglobin * Low ferritin * Microcytic/hypochromic RBCs Iron teaching: * Take as directed * Vitamin C can improve absorption * Dark stools are common * Constipation can occur * Liquid iron may stain teeth ⸻ Leukemia Cancer of blood-forming tissues. Possible findings: * Infection → abnormal WBC function * Anemia → fatigue/pallor * Bleeding → low platelets * Bone/joint pain Think: Leukemia = infection + anemia + bleeding Nursing priorities: * Infection prevention * Bleeding precautions when indicated * Monitor CBC * Oral care * Avoid unnecessary invasive procedures * Monitor treatment adverse effects ⸻ 🍽️ 4. GASTROINTESTINAL SYSTEM Crohn’s vs Colitis Crohn’s Ulcerative Colitis Can affect anywhere mouth → anus Colon/rectum “Skip lesions” Continuous inflammation Transmural Mainly mucosal Fistulas common Bloody diarrhea common Strictures possible Toxic megacolon risk Crohn’s Watch for: * Diarrhea * Abdominal pain * Weight loss * Malnutrition * Fistulas Ulcerative colitis Watch for: * Bloody diarrhea * Abdominal cramps * Urgency * Risk of toxic megacolon ⸻ Diverticulitis Inflammation/infection of diverticula. Signs: * Usually LLQ abdominal pain * Fever * Change in bowel habits During acute inflammation: * Follow prescribed bowel-rest/diet plan * Monitor pain, fever and abdominal status * Watch for perforation/peritonitis ⸻ Colorectal Cancer Red flags: * Change in bowel habits * Blood in stool * Unexplained weight loss * Iron-deficiency anemia * Abdominal discomfort Important: Screening is important even before symptoms occur. ⸻ Constipation Risk factors: * Opioids * Immobility * Low fluid intake * Low fibre * Some medications Management: * Fluids if not contraindicated * Fibre * Activity * Bowel routine * Appropriate laxatives/stool softeners ⸻ Diarrhea Priority concerns: Fluid + electrolytes + cause Assess: * Frequency * Stool characteristics * Blood * Fever * Abdominal pain * Hydration * Recent antibiotics/travel/exposure ⸻ Peptic Ulcer Disease Major complications: * Bleeding * Perforation * Gastric outlet obstruction Warning signs: * Hematemesis * Melena * Sudden severe abdominal pain * Rigid abdomen Common causes: * H. pylori * NSAIDs ⸻ Appendicitis Classic: * Pain may begin around umbilicus and migrate to RLQ * Fever * Nausea/vomiting * Rebound/guarding may occur Priority Prevent rupture. Avoid: * Laxatives * Enemas * Applying heat to abdomen ⸻ 🚰 5. RENAL SYSTEM UTI Symptoms: * Dysuria * Frequency * Urgency * Suprapubic discomfort If infection reaches kidneys: * Fever * Flank pain * Chills * Nausea/vomiting Nursing * Obtain urine specimen correctly * Culture before antibiotics when ordered/appropriate * Encourage fluids if not contraindicated * Complete antibiotics ⸻ Renal Failure Major problems: Think: * Fluid overload * Electrolyte imbalance * Acid-base imbalance * Uremia * Anemia Possible findings: * Edema * Hypertension * Fatigue * Decreased urine output * Nausea * Confusion Particularly important: Hyperkalemia can cause life-threatening dysrhythmias. ⸻ Dialysis Hemodialysis Blood is filtered through a machine. Assess: * Weight * BP * Fluid status * Access site AV fistula Remember: “Feel + Hear” * Thrill → feel it * Bruit → hear it Protect the access: * No BP on that arm * No blood draws on that arm when avoidable * Don’t compress unnecessarily ⸻ Incontinence Types: Stress → coughing/sneezing Urge → sudden strong urge Overflow → bladder doesn’t empty Functional → can’t get to toilet Mixed → combination Management depends on cause. ⸻ 🫁 6. RESPIRATORY SYSTEM COPD Includes chronic bronchitis and emphysema. Common: * Dyspnea * Chronic cough * Sputum * Wheezing * Reduced exercise tolerance Nursing: * Position upright * Pursed-lip breathing * Energy conservation * Smoking cessation * Oxygen as prescribed * Inhaler technique Don’t automatically assume oxygen should be withheld from COPD patients. Oxygen is prescribed/titrated according to the patient’s clinical status and target saturation. ⸻ Asthma Usually reversible airway obstruction/inflammation. Symptoms: * Wheezing * Cough * Dyspnea * Chest tightness Rescue medication Short-acting bronchodilator, e.g. salbutamol. Controller Often: Inhaled corticosteroid Severe attack Red flags: * Difficulty speaking * Severe respiratory distress * Exhaustion * Altered LOC * Silent chest Silent chest = very serious. ⸻ Pneumonia Signs: * Fever * Cough * Sputum * Dyspnea * Crackles * Pleuritic chest pain Nursing: * Oxygen if needed * Antibiotics if bacterial/ordered * Hydration if appropriate * Mobilization * Cough/deep breathing * Monitor respiratory status ⸻ Lung Cancer Risk factors: * Smoking * Environmental/occupational exposures Symptoms: * Persistent cough * Hemoptysis * Weight loss * Dyspnea * Chest pain ⸻ Tuberculosis Classic: * Persistent cough * Fever * Night sweats * Weight loss * Possible hemoptysis Nursing priority Airborne precautions for suspected/confirmed infectious pulmonary TB according to institutional policy. ⸻ Atelectasis Collapsed alveoli, often after surgery. Prevention: * Deep breathing * Coughing * Incentive spirometry * Early mobilization * Adequate pain control ⸻ Pneumothorax Air in pleural space → lung collapse. Possible: * Sudden dyspnea * Chest pain * Decreased/absent breath sounds Tension pneumothorax Emergency. May cause: * Severe respiratory distress * Hypotension * Distended neck veins * Tracheal deviation * Cardiovascular collapse Requires immediate emergency treatment. ⸻ Hemothorax Blood in pleural space. Think: Respiratory compromise + blood loss. Chest tube may be required. ⸻ 🦴 7. MUSCULOSKELETAL Osteoporosis Loss of bone density. Risk: * Fractures * Vertebral compression * Hip fracture Prevention: * Weight-bearing activity * Calcium/vitamin D as appropriate * Fall prevention * Avoid smoking * Limit excessive alcohol ⸻ Fractures Priority: ABCs → bleeding → neurovascular status Assess the 6 Ps: * Pain * Pallor * Pulselessness * Paresthesia * Paralysis * Poikilothermia/coolness Neurovascular assessment is critical. ⸻ Arthritis Osteoarthritis Think: Wear and tear * Pain with activity * Stiffness * Often affects weight-bearing joints Rheumatoid arthritis Think: Autoimmune * Symmetrical joint involvement * Morning stiffness * Systemic effects ⸻ Scoliosis Abnormal lateral curvature of spine. Assess: * Posture * Shoulder/hip asymmetry * Spinal curvature * Respiratory effects if severe ⸻ Multiple Sclerosis Autoimmune demyelinating disease affecting CNS. Possible: * Weakness * Fatigue * Visual disturbances * Sensory changes * Balance problems * Bladder dysfunction Important nursing concept: Fatigue and heat can worsen symptoms. ⸻ 🦠 8. INFECTION/IMMUNE SYSTEM MRSA Methicillin-resistant Staphylococcus aureus. Key: * Resistant to several antibiotics * Contact precautions may be required * Strict hand hygiene ⸻ VRE Vancomycin-resistant enterococci. Key: * Resistant organism * Contact precautions according to facility policy * Hand hygiene * Environmental cleaning ⸻ C. difficile Often associated with antibiotic exposure. Symptoms: * Frequent watery diarrhea * Abdominal cramping * Fever VERY IMPORTANT Soap and water handwashing is preferred because alcohol-based hand sanitizer does not reliably kill C. difficile spores. Use appropriate contact/spore precautions according to facility policy. ⸻ Influenza * Fever * Cough * Myalgias * Fatigue * Headache Prevention: Annual vaccination + respiratory hygiene. ⸻ Sepsis Think: Infection + organ dysfunction Potential signs: * Fever or hypothermia * Tachycardia * Tachypnea * Altered mental status * Hypotension * Reduced urine output * Elevated lactate Nursing priority Recognize early and escalate rapidly. Expect: * Cultures * Lactate * IV fluids when indicated * Prompt antimicrobials when sepsis is suspected * Source control * Frequent reassessment ⸻ 🔬 9. DIAGNOSTIC TESTS Don’t memorize only the test. For every test ask: 1. Why is it being done? 2. What does it tell me? 3. What does the nurse do before? 4. What does the nurse do after? 5. What complications should I watch for? ⸻ CT Uses X-rays to create detailed cross-sectional images. Contrast may be used. Nursing: * Check allergies/previous contrast reactions * Assess kidney function when appropriate * Follow contrast-specific instructions ⸻ MRI Uses magnetic field. NO metal/unsafe metallic objects. Assess: * Implanted devices * Metal fragments * Claustrophobia ⸻ X-ray Useful for: * Fractures * Chest conditions * Some abdominal problems ⸻ Ultrasound Uses sound waves. Common: * Pregnancy * Abdomen * Pelvis * Blood vessels No ionizing radiation. ⸻ Mammogram Breast imaging for screening/assessment. ⸻ Endoscopy Allows direct visualization of GI tract. Nursing: * Usually NPO beforehand * Sedation may be used * Monitor airway and vital signs afterward * Ensure gag/swallow reflex has returned before oral intake when applicable ⸻ Bronchoscopy Visualizes airways. Post-procedure: * Monitor respiratory status * Watch for bleeding * Keep NPO until protective reflexes return if sedated/topical anesthetic used ⸻ Pulmonary Function Tests Measure lung function. Important for: * Asthma * COPD * Other pulmonary disorders ⸻ 🧪 10. LABORATORY VALUES For exams, know what the lab means, not just the number. CBC Hemoglobin/Hematocrit Think: oxygen-carrying capacity Low → anemia/bleeding/etc. WBC Think: infection/inflammation/immune response Platelets Think: clotting Low → bleeding risk. ⸻ INR Measures effect of warfarin therapy. Higher INR generally = increased anticoagulation and bleeding risk. Monitor for: * Bleeding * Bruising * Hematuria * Melena ⸻ Glucose Think: current blood glucose ⸻ HbA1c Think: “3-month-ish glucose picture.” Used for longer-term diabetes management. ⸻ BUN + Creatinine Think: Kidney function. Creatinine is particularly useful when evaluating renal function. ⸻ GFR Estimates kidney filtration. Lower GFR generally = worse kidney function. ⸻ Electrolytes Sodium Think: water balance + neurological function Potassium Think: heart rhythm Abnormal potassium can cause dangerous dysrhythmias. Calcium Think: bones + muscles + nerves ⸻ Cholesterol LDL “Lousy” cholesterol Higher LDL → increased cardiovascular risk. HDL “Healthy” cholesterol Generally protective. ⸻ Urinalysis Can help identify: * UTI * Protein * Blood * Glucose * Ketones * Kidney problems ⸻ Culture & Sensitivity Culture = What organism? Sensitivity = Which antibiotic is effective? ⸻ 💊 11. PHARMACOLOGY For every medication, memorize: Class → Why given → Major adverse effects → Contraindications/precautions → Nursing assessments → Patient teaching ⸻ Acetaminophen (Tylenol) Used for: * Pain * Fever Major concern: Liver toxicity with excessive dosing. ⸻ NSAIDs Examples: * Ibuprofen * Naproxen Watch for: * GI bleeding * Kidney injury * Fluid retention * Cardiovascular risks ⸻ Morphine Opioid. Watch: * Respiratory depression * Sedation * Hypotension * Constipation * Nausea Antidote for opioid-induced respiratory depression: Naloxone ⸻ Antibiotics Key nursing principle: Complete the prescribed course unless directed otherwise. Watch: * Allergic reactions * Diarrhea * Superinfection * C. difficile ⸻ Warfarin (Coumadin) Anticoagulant. Monitor: INR Major complication: Bleeding Teaching: * Consistent vitamin K intake rather than suddenly changing intake * Drug interactions matter * Report unusual bleeding ⸻ Heparin Anticoagulant. Monitor: * Bleeding * Platelets * aPTT for unfractionated heparin, depending on protocol Major complication: Bleeding Important adverse reaction: HIT – heparin-induced thrombocytopenia ⸻ Insulin Major adverse effect: HYPOGLYCEMIA Know: * Onset * Peak * Duration * Administration technique * Glucose monitoring ⸻ Nitroglycerin Used for angina. Can cause: * Headache * Hypotension * Dizziness Avoid with PDE-5 inhibitors. ⸻ Digoxin Remember: “Slow heart + low potassium = danger.” Monitor: * Apical pulse * Potassium * Signs of toxicity ⸻ Diuretics Example: Furosemide (Lasix) Causes: * Increased urine output * Decreased fluid volume Watch: * BP * Electrolytes * Dehydration * Potassium ⸻ Corticosteroids Example: Prednisone Long-term effects: * Infection risk * Hyperglycemia * Osteoporosis * Fluid retention * Skin changes * Adrenal suppression Do not abruptly stop long-term corticosteroids without medical direction. ⸻ Bronchodilators Example: Salbutamol Can cause: * Tremor * Tachycardia * Nervousness ⸻ Inhaled corticosteroids Important: Rinse mouth after use. Helps prevent oral candidiasis. ⸻ Statins Example: Atorvastatin Used to lower cholesterol. Watch: * Muscle pain/weakness * Liver-related adverse effects ⸻ Stool medications Psyllium Bulk-forming. Requires adequate fluid intake unless contraindicated. Docusate Stool softener. Stimulant laxatives Increase intestinal motility. ⸻ 🧠 12. NEUROLOGICAL Seizure During seizure: Protect, don’t restrain. * Protect from injury * Turn to side if possible * Protect airway * Remove nearby hazards * Don’t put anything in mouth * Time the seizure After: * Assess airway * Vital signs * Neurological status * Document characteristics Status epilepticus Emergency. ⸻ Increased Intracranial Pressure Think: Headache + vomiting + decreased LOC + pupil changes Late sign: Cushing’s triad * Increased BP/widened pulse pressure * Bradycardia * Irregular respirations Nursing: * Elevate head as ordered * Maintain neutral neck alignment * Avoid unnecessary stimulation * Monitor neurological status * Prevent hypoxia/hypercapnia ⸻ Parkinson’s Disease Classic: TRAP T – Tremor R – Rigidity A – Akinesia/bradykinesia P – Postural instability Nursing: * Fall prevention * Mobility support * Medication timing * Swallowing assessment * Nutrition ⸻ Spinal Cord Injury Priority: Airway + breathing + immobilization + neurological assessment Possible complications: * Neurogenic shock * Autonomic dysreflexia * Respiratory compromise * Loss of bowel/bladder control * Pressure injuries Autonomic dysreflexia Usually associated with injuries at/above T6. Signs: * Sudden severe hypertension * Headache * Flushing/sweating above injury * Bradycardia Priority: Sit patient upright and identify/remove the trigger. ⸻ 👁️ 13. SENSORY Cataracts Clouding of lens. Symptoms: * Blurred vision * Glare * Reduced visual acuity Treatment: Surgical removal when significantly affecting vision. ⸻ Glaucoma Optic nerve damage often associated with increased intraocular pressure. Key distinction: Glaucoma → pressure/optic nerve Cataract → cloudy lens Acute angle-closure glaucoma: * Severe eye pain * Headache * Halos * Nausea/vomiting * Red eye Emergency. ⸻ Hearing Loss Conductive Problem with sound transmission through outer/middle ear. Sensorineural Problem involving inner ear/auditory nerve. Communication: * Face patient * Speak clearly * Don’t shout * Reduce background noise * Verify understanding ⸻ 🔥 14. BURNS Think: Airway → Breathing → Circulation Inhalation injury Red flags: * Facial burns * Soot * Singed nasal hairs * Hoarseness * Stridor * Carbonaceous sputum Airway edema can worsen rapidly. ⸻ Burn priorities * Airway * Breathing * Circulation * Fluid resuscitation for significant burns * Pain management * Infection prevention * Temperature control * Nutrition * Wound care ⸻ 15. WOMEN’S & MEN’S HEALTH Menopause Decrease in estrogen. Common: * Hot flashes * Night sweats * Sleep problems * Vaginal dryness * Mood changes Long-term: * Bone loss * Cardiovascular considerations ⸻ Birth Control Know: * Effectiveness * How it is used * Contraindications * STI protection Most hormonal birth control does NOT protect against STIs. Condoms help reduce STI transmission. ⸻ STIs Examples: * Chlamydia * Gonorrhea * Syphilis * HPV * Herpes * HIV Nursing: * Testing * Treatment adherence * Partner notification/treatment when appropriate * Safer sex education * Prevention ⸻ Breast Cancer Warning signs: * New breast lump * Skin changes * Nipple changes/discharge * Axillary lymph node changes Know current screening recommendations and individual risk factors. ⸻ Prostate Cancer Possible: * Urinary hesitancy * Weak stream * Frequency * Hematuria Important: Early prostate cancer may have no symptoms. ⸻ 🚨 16. EMERGENCY NURSING Shock Basic concept: Tissues aren’t receiving enough oxygen/perfusion. Signs: * Tachycardia * Hypotension * Altered LOC * Cool/clammy skin in many shock states * Decreased urine output * Tachypnea Major types Hypovolemic → blood/fluid loss Cardiogenic → pump failure Distributive → vasodilation (e.g., septic/anaphylactic) Obstructive → obstruction to circulation Priority: ABCs + identify/treat cause + restore perfusion. ⸻ Hemorrhage Look for: * Tachycardia * Hypotension * Pallor * Weakness * Decreased LOC * Decreased urine output Priority: Control bleeding + support circulation + escalate. ⸻ Anaphylaxis Severe allergic reaction. Signs: * Airway swelling * Wheezing * Dyspnea * Hypotension * Hives * GI symptoms FIRST-LINE MEDICATION: IM epinephrine Do not delay epinephrine while waiting for other treatments. ⸻ 💧 17. FLUID & ELECTROLYTES Dehydration Signs: * Thirst * Dry mucous membranes * Tachycardia * Hypotension * Poor skin turgor * Decreased urine output * Weight loss ⸻ Fluid overload Signs: * Edema * Crackles * Dyspnea * Weight gain * JVD * Hypertension ⸻ Potassium Hypokalemia Think: Weak + irregular heart Causes: * Diuretics * GI losses Hyperkalemia Think: Dangerous heart rhythm Causes: * Renal failure * Tissue breakdown * Certain medications ⸻ Acid-Base Use: ROME Respiratory = Opposite Metabolic = Equal Examples: Respiratory acidosis CO₂ ↑ → pH ↓ Respiratory alkalosis CO₂ ↓ → pH ↑ Metabolic acidosis HCO₃ ↓ → pH ↓ Metabolic alkalosis HCO₃ ↑ → pH ↑ ⸻ 👶 MATERNAL-CHILD NURSING Prenatal Care Monitor: * Maternal vital signs * Weight * Blood pressure * Urine * Fetal growth * Fetal heart rate * Laboratory screening * Risk factors Important warning signs: * Vaginal bleeding * Severe headache * Visual changes * Severe abdominal pain * Fluid leakage * Decreased fetal movement * Sudden swelling/other signs of hypertensive disorders ⸻ Fetal Development High-yield concept: First trimester → organ formation Second trimester → growth and development Third trimester → maturation and preparation for birth ⸻ Labour Stage 1 Onset of true labour → complete cervical dilation. Stage 2 Complete dilation → birth of baby. Stage 3 Birth of baby → delivery of placenta. Stage 4 Immediate postpartum recovery. ⸻ Apgar At approximately 1 and 5 minutes. A P G A R A – Appearance P – Pulse G – Grimace A – Activity R – Respiration Each scored 0–2. Apgar helps assess newborn adaptation; it does not by itself diagnose asphyxia or determine long-term prognosis. ⸻ Newborn Assessment Assess: * Respiratory effort * Heart rate * Temperature * Colour * Tone * Feeding * Reflexes * Weight * Head circumference * Urine/stool ⸻ Breastfeeding Benefits: * Nutrition * Immune protection * Bonding Signs of effective feeding: * Good latch * Audible swallowing * Appropriate wet/dirty diapers * Expected weight pattern ⸻ 👶 PEDIATRIC NURSING Development General progression: Head → toe Simple → complex Large muscles → fine motor Always consider developmental stage when communicating with children. ⸻ Pediatric Safety Big priorities: * Falls * Choking * Burns * Poisoning * Drowning * Car-seat safety * Medication dosing * Safe sleep Medication principle Pediatric medications are often based on: weight (kg) Always verify calculations and concentrations. ⸻ Pediatric Asthma Same basic principles as adults: * Bronchodilator for acute symptoms * Controller medications for long-term control * Trigger avoidance * Asthma action plan ⸻ RSV Common in infants/young children. Signs: * Rhinorrhea * Cough * Wheezing * Increased work of breathing * Poor feeding Priority: Respiratory assessment and hydration. ⸻ Croup Classic: Barking cough + stridor Often worse at night. Severe respiratory distress requires urgent intervention. ⸻ Cystic Fibrosis Thick secretions affect lungs and GI system. Think: “Thick mucus + lung infections + malabsorption.” Nursing: * Airway clearance * Nutrition * Pancreatic enzymes when prescribed * High-calorie/high-protein nutrition * Infection prevention ⸻ Gastroenteritis Major concern: Dehydration. Assess: * Wet diapers/urine * Mucous membranes * Tears * Capillary refill * Weight * Activity/LOC ⸻ Pyloric Stenosis Classic: Projectile, non-bilious vomiting Often occurs in young infants. Possible: * Hunger after vomiting * Dehydration * Weight loss ⸻ ASD vs VSD ASD Hole between atria. VSD Hole between ventricles. VSD can produce: A significant murmur and increased pulmonary blood flow. ⸻ Sickle Cell Disease Problem: Abnormal hemoglobin → sickled RBCs → vaso-occlusion and hemolysis. Crisis triggers: * Dehydration * Infection * Hypoxia * Stress Management: * Hydration * Oxygen if hypoxemic * Pain management * Treat infection * Rest * Disease-specific therapies ⸻ Meningitis Think: Fever + headache + stiff neck + altered mental status May also have: * Photophobia * Vomiting * Seizures Emergency. Use appropriate isolation precautions according to suspected organism and institutional policy. ⸻ Hydrocephalus Excess CSF. Infants may have: * Increasing head circumference * Bulging fontanelle * Irritability * Poor feeding * “Sunsetting” eyes Older children: * Headache * Vomiting * Visual changes * Altered LOC ⸻ 🧠 MENTAL HEALTH NURSING Therapeutic Communication DO: * Use open-ended questions * Listen * Reflect * Clarify * Validate feelings * Maintain appropriate boundaries DON’T: * Give false reassurance * Judge * Argue * Give excessive advice * Say “everything will be fine” ⸻ Depression Symptoms: * Persistent sadness * Anhedonia * Sleep changes * Appetite changes * Fatigue * Poor concentration * Feelings of worthlessness * Suicidal thoughts Nursing priority: Assess suicide risk directly. ⸻ Bipolar Disorder Mania * Elevated/irritable mood * Increased energy * Decreased need for sleep * Rapid speech * Impulsivity * Grandiosity Nursing: * Reduce stimulation * Maintain safety * Set clear limits * Encourage nutrition/hydration * Administer medications as prescribed ⸻ Schizophrenia Positive symptoms: * Hallucinations * Delusions * Disorganized speech/behaviour Negative symptoms: * Flat affect * Social withdrawal * Reduced motivation Communication Don’t argue with delusions. Instead: Acknowledge the patient’s feelings while presenting reality. ⸻ OCD Obsessions: Intrusive thoughts Compulsions: Repetitive behaviours/mental acts ⸻ Eating Disorders Watch: * Electrolytes * Cardiac rhythm * Nutrition * Weight * Refeeding complications * Psychological safety ⸻ Substance Use Priorities: * Airway/breathing/circulation * Overdose recognition * Withdrawal * Safety * Nonjudgmental communication ⸻ 🧪 HIGH-YIELD DIAGNOSTIC TEST THINKING When you see a test question, ask: “Why are they ordering this?” Examples: CT head after sudden neurological deficit → looking for bleeding/structural abnormalities. MRI → detailed soft tissue/neurological/musculoskeletal imaging. ECG → electrical activity/ischemia/dysrhythmia. Troponin → myocardial injury. HbA1c → long-term glucose control. Creatinine/GFR → kidney function. INR → warfarin effect. Culture and sensitivity → organism + effective antimicrobial. Pulmonary function test → lung function/obstruction/restriction. ⸻ 💊 PHARMACOLOGY MASTER MEMORY MAP Instead of memorizing 100 medications individually, memorize the danger associated with each class: Drug/Class Think Insulin Hypoglycemia Opioids Respiratory depression Warfarin Bleeding + INR Heparin Bleeding + HIT Furosemide Fluid/electrolyte loss Digoxin Bradycardia/toxicity ACE inhibitors Hyperkalemia + cough/angioedema Beta blockers Bradycardia/hypotension Steroids Hyperglycemia + infection NSAIDs GI bleeding + kidney injury Statins Muscle/liver effects Bronchodilators Tachycardia/tremor Inhaled steroids Oral candidiasis Antibiotics Allergy + C. diff ⸻ 🚨 THE “PRIORITY QUESTION” METHOD When you’re stuck on an exam question, ask: 1. Is the airway threatened? If yes → AIRWAY 2. Is breathing compromised? If yes → BREATHING 3. Is circulation/perfusion compromised? If yes → CIRCULATION 4. Is there an acute neurological deterioration? Think neurological emergency. 5. Is there a safety risk? Falls, suicide, aspiration, seizures, etc. 6. Which patient is deteriorating? Unstable beats stable. ⸻ ⭐ TOP THINGS I WOULD MEMORIZE FIRST If you have limited study time, prioritize these: 🚨 Emergencies * Anaphylaxis → IM epinephrine * Stroke → BE FAST + last known well * MI → ECG + rapid intervention * Sepsis → early recognition + rapid treatment * Tension pneumothorax → emergency * Severe hypoglycemia → rapid glucose treatment * Status epilepticus → emergency * Increased ICP → neurological deterioration * Hemorrhage → control bleeding + perfusion * Severe burns → ABCs 💊 Medications * Insulin → hypoglycemia * Morphine → respiratory depression * Warfarin → INR/bleeding * Heparin → bleeding/HIT * Digoxin → pulse/potassium/toxicity * Furosemide → fluid/electrolytes * Nitroglycerin → hypotension + PDE-5 interaction * Steroids → infection/hyperglycemia * Antibiotics → allergy/C. diff * Inhaled steroids → rinse mouth 🧪 Labs * Hb → oxygen carrying * WBC → infection/immune response * Platelets → bleeding/clotting * INR → warfarin * Glucose → current sugar * HbA1c → long-term glucose * Creatinine/GFR → kidney * K⁺ → heart rhythm * Na⁺ → neurological/fluid balance * Culture → organism * Sensitivity → antibiotic choice 🩺 Nursing skills * Infection control * Medication administration * IVs * Oxygen * Suction * Tracheostomy * Chest tubes * Urinary catheter * Wound care * Ostomy care * Vital signs * Neurovascular assessment * Respiratory assessment ⸻ 📚 How I’d recommend studying this huge syllabus Don’t try to study all of these diseases in one sitting. Use system blocks: Day 1: Diabetes + cardiovascular Day 2: Respiratory + renal Day 3: GI + liver Day 4: Hematology + immune/infection Day 5: Neuro + musculoskeletal Day 6: Maternal/newborn Day 7: Pediatrics Day 8: Mental health Day 9: Pharmacology Day 10: Labs + diagnostics + clinical skills Day 11: Emergency/priority questions Day 12: Full mixed practice exam + review weak areas For each condition, make yourself answer only 5 questions: 1. What is happening? 2. What will I assess? 3. What is the biggest complication? 4. What will I do first? 5. What do I teach the patient? That approach will help you think like a nurse rather than memorize isolated facts, which matches the study framework you were given.

Thriller(альбом)

Psychological Thriller and Novel Vocabulary

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What are some examples of human behaviors that might be considered instinctual? Human instinctual behaviors include newborn reflexes (like grasping), fear responses (like loud noises or heights), bonding between parents and children, facial expressions (like smiling and crying), the fight-or-flight response, imitation, language learning ability, and the need for social connection. In Drive-Reduction Theory, what is meant by a “drive”? What about “homeostasis”? In Drive-Reduction Theory, a “drive” is an internal state of tension or discomfort caused by an unmet biological need, such as hunger or thirst, that motivates a person to act. “Homeostasis” refers to the body’s tendency to maintain a stable and balanced internal state, so behaviors are motivated by the desire to reduce drives and restore balance. How is the Arousal Theory different from Drive-Reduction Theory? Arousal Theory focuses on seeking an optimal level of stimulation, while Drive-Reduction Theory focuses on reducing biological needs. Arousal explains thrill-seeking; drive-reduction explains behaviors like eating when hungry. How does Maslow’s Hierarchy suggest we prioritize our goals? Maslow's Hierarchy of Needs suggests that people tend to prioritize basic needs before higher-level goals. According to the theory, physiological needs like food and sleep come first, followed by safety, love and belonging, esteem, and finally self-actualization, which involves reaching one’s full potential. The idea is that lower-level needs usually must be reasonably satisfied before a person focuses strongly on higher-level needs. Give a real-life example of each level of Maslow’s hierarchy. In Maslow's Hierarchy of Needs, physiological needs include food and sleep, safety needs include shelter and security, love and belonging involve friendships and family, esteem needs include confidence and respect, and self-actualization involves reaching personal goals and potential. Why might Maslow's theory be criticized across different cultures?+ù Maslow's Hierarchy of Needs may be criticized across cultures because it reflects individualistic values, such as personal achievement and self-actualization, which may not be prioritized equally in all societies. In some cultures, community, family, or group needs may be considered more important than individual goals. What is the difference between intrinsic and extrinsic motivation? Intrinsic Motivation comes from internal enjoyment or personal satisfaction, while Extrinsic Motivation comes from external rewards or pressures, such as money, grades, or praise. Which type of motivation do you think leads to more lasting change? Why? Intrinsic Motivation usually leads to more lasting change because the behavior is driven by genuine interest, enjoyment, or personal meaning, so it continues even without external rewards. Extrinsic Motivation can be effective in the short term, but the behavior often stops when rewards or pressure are removed, since the motivation depends on outside factors rather than internal commitment. What are the traits of someone with a high need for achievement? A person with a high need for achievement sets challenging but realistic goals, prefers tasks with clear personal responsibility, seeks feedback, and is persistent. They are motivated by doing well and improving rather than just external rewards. Why might low achievers choose tasks that are either very easy or very hard? People with a low need for achievement may choose very easy tasks because they are almost guaranteed success, which helps them avoid failure and protect their self-esteem. They may also choose very hard tasks because failure can be blamed on the difficulty of the task rather than their ability, which also protects their self-image. What role does the hypothalamus play in hunger? The hypothalamus helps regulate hunger by monitoring the body’s energy needs and signaling when to eat or stop eating. Different parts work together: one area triggers hunger when energy is low, while another signals fullness after eating. It responds to hormones, blood sugar levels, and signals from the stomach to maintain balance. What is the difference between set point theory and settling point theory? Set point theory says the body has a fixed, biologically controlled weight it tries to maintain. Settling point theory says weight is flexible and depends on lifestyle and environment, so it can change over time. What psychological and social cues can influence how much we eat? Psychological cues like stress, mood, and distraction can increase or decrease how much we eat. Social cues such as eating with others, portion sizes, and cultural expectations also strongly influence eating behavior. What are the symptoms of anorexia nervosa? Anorexia Nervosa includes extreme food restriction, significant weight loss, intense fear of gaining weight, and a distorted body image. It can also cause fatigue, dizziness, feeling cold, and in some cases, serious health problems. How does bulimia differ from anorexia? Bulimia Nervosa involves binge eating followed by purging and often normal weight. Anorexia Nervosa involves severe food restriction and very low body weight. How might perfectionism be linked to the development of eating disorders? Perfectionism can lead people to set unrealistically high standards for their body, weight, or eating habits, which increases stress and dissatisfaction. This pressure can contribute to restrictive eating or binge-purge behaviors as they try to “achieve” an ideal body image. According to James-Lange theory, what comes first: the emotion or the physical response? According to James-Lange Theory, the physical response comes first. The body reacts to a stimulus, and then the brain interprets those physical changes as an emotion. How does Cannon-Bard theory explain simultaneous emotion and bodily reaction? Cannon-Bard Theory says emotion and bodily reaction happen at the same time. A stimulus triggers the brain to send signals that produce both the emotional experience and the physical response simultaneously, rather than one causing the other. What evidence supports the idea that emotions are biologically universal? Evidence shows people across cultures recognize the same facial expressions, and even blind people show them, suggesting emotions are biologically universal. Similar brain activity patterns also support this idea. . What are Paul Ekman’s universal emotions? Paul Ekman identified six universal emotions: happiness, sadness, anger, fear, disgust, and surprise. How might facial expressions influence how we feel? Facial expressions can shape emotions through the idea that acting a certain way can influence how we feel internally. For example, smiling may increase feelings of happiness, while frowning can intensify sadness. Body and facial feedback to the brain helps reinforce or even create emotional experiences. Why is it important to recognize that emotions can be expressed differently across cultures? Paul Ekman shows some emotions are universal, but recognizing cultural differences matters because people can display and interpret emotions in different ways across cultures. Misunderstanding these differences can lead to miscommunication or incorrect judgments about others’ feelings or intentions

Genera: Postmodernism – after modernism, reaction to modernism, bleed into popular music.is a late 20thcentury movement in philosophy, art, and culture that questions established norms, embraces pluralism, and often rejects the idea of objective truth Pendercki – graphic scores, microtones, extended technique Cage – Conceptual art Glass – Minimalism Pop(ular)- made to sell, simple and easy. Edison invents sound recording, frank Sinatra in jazz Blues- originated among African Americans in the Deep South of the United States around the 1860s. Blues is party music, sad songs. Country- largely from the British (Irish) tradition, Appalachia called “Hillbilly” – oral tradition. Made into pop, appellation mountains. From Ireland. Rock and Roll – fast and organic, Baby Boomers R&B and Country mix Bill Hayley and the Comets Elvis Presley - debatably greatest selling artist of all time Soul- rhythm and blues with gospel singing. musical representation of the Civil Rights Movement R&B + Gospel, Ray Charles, James Brown – Cells becomes Funk, becomes Hip Hop, seeking end segregation. Folk- (music of the people) like country long unwritten tradition), social activism. Bob dylan Rock- music is a genre of popular music characterized by strong beats, electric guitar-driven sound, and a cultural emphasis on rebellion and self-expression. Disco- pop in 70’s, whole bunch of money it does go to gay club. Edm, influences pop music. Punk – united by nihilism- no value in anything, reaction corporate in the 70’s Rap- dance halls of Jamaica influenced by disco, Jamaica making up lyrics, 70’s house parties. Alternative- 90’s, alternative to modern music, to pop, rock hits. Nouns: Penderecki - Polish composer, noted for his highly individual orchestration Cage- concept composition Glass- minimalist composition Frank Sinatra- pop singer, jazz? Miles Davis- trumpet jazz composer best album Baby Boomers- born after world war 2 Elvis- selling artist of all time, started then helped James Brown- soul Bob Dylan- folk Beatles- influential group, introduces rock and roll in pop music, psychedelia involved Michael Jackson- king of pop, thriller- greatest album Public Enemy-golden age rap music, politcal Nirvana- 1990s reinvents rock, metal with punk, grunge, alternative Napster- music file-sharing computer service created by American college student Shawn Fanning in 1999. Max Martin- song writer, producer Technical: Social Activism- music for political change Concept Album- story by album, dark side of moon Psychedelia- movement of drugs, philosophy Nihilism- punk philosophy, belief that nothing matters at all Scratching- scratching records like in the video Synthesizer- electronic instruments, 80’s

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Perception The process of organizing and interpreting sensory information to give meaning to our environment. Bottom-up processing An approach where perception starts with sensory input and works up to the brain's integration of this information. Top-down processing Information processing guided by higher-level mental processes, drawing on experience and expectations to construct perceptions. Schema A concept or framework that organizes and interprets information. Perceptual set A mental predisposition to perceive one thing and not another. Gestalt psychology Emphasizes that we often perceive the whole rather than the sum of the parts. Closure The perceptual tendency to mentally fill in gaps in a visual image to perceive objects as wholes. Figure and ground The organization of the visual field into objects (figures) that stand out from their surroundings (ground). Proximity The perceptual tendency to group together visual and auditory events that are near each other. Similarity The perceptual tendency to group together elements that seem alike. Attention The focusing of mental resources on select information. Selective attention The focusing of conscious awareness on a particular stimulus. Cocktail party effect The ability to focus auditory attention on a particular stimulus while filtering out other stimuli. Inattentional blindness Failing to see visible objects when attention is directed elsewhere. Change Blindness Failing to notice changes in the environment. Binocular depth cues Depth cues, such as retinal disparity, that depend on the use of two eyes. Retinal disparity A binocular cue for perceiving depth by comparing images from the retinas in the two eyes. Convergence A binocular cue for perceiving depth by the extent to which the eyes converge inward when looking at an object. Monocular depth cues Depth cues, such as interposition and linear perspective, available to either eye alone. Relative clarity A monocular cue for perceiving depth; hazy objects are seen as farther away than sharp, clear objects. Relative size A cue that allows determining the closeness of objects to an object of known size. Texture gradient A gradual change from coarse to fine texture signaling increasing distance. Linear perspective Parallel lines appear to converge with distance. Aptitude tests Tests designed to predict a person's future performance; aptitude is the capacity to learn. Fixed mindset The idea that we have a set amount of an ability that cannot change. Growth mindset The belief that one's skills and qualities can change and improve through effort and dedication. Explicit memory Memory of facts and experiences that one can consciously know and 'declare.' Episodic memory The collection of past personal experiences that occurred at a particular time and place. Semantic memory Memory for factual information. Implicit memory Retention independent of conscious recollection. Procedural memory A type of long-term memory of how to perform different actions and skills. Prospective memory Remembering to perform a planned action or recall a planned intention at some future point in time. Long-term potentiation An increase in a cell's firing potential after brief, rapid stimulation. Believed to be a neural basis for learning and memory. Working memory model A model that suggests that memory involves a series of active, temporary memory stores that manipulate information. Working memory A newer understanding of short-term memory that involves conscious, active processing of incoming auditory and visual-spatial information, and of information retrieved from long-term memory. Central executive The part of working memory that directs attention and processing. Phonological loop The part of working memory that holds and processes verbal and auditory information. Visuospatial sketchpad The part of working memory that holds visual and spatial information. Multi-store model A model of memory that suggests information passes through three stages: sensory memory, short-term memory, and long-term memory. Sensory memory The immediate, very brief recording of sensory information in the memory system. Iconic memory A momentary sensory memory of visual stimuli; a photographic or picture-image memory lasting no more than a few tenths of a second. Echoic memory A momentary sensory memory of auditory stimuli; if attention is elsewhere, sounds and words can still be recalled within 3 or 4 seconds. Short-Term Memory Activated memory that holds a few items briefly before the information is stored or forgotten. Long-Term Memory The relatively permanent and limitless storehouse of the memory system. Includes knowledge, skills, and experiences. Automatic processing Unconscious encoding of incidental information, such as space, time, and frequency, and of well-learned information. Effortful processing Encoding that requires attention and conscious effort. Encoding The processing of information into the memory system—for example, by extracting meaning. Storage The retention of encoded information over time. Retrieval The process of getting information out of memory storage. Levels of processing model The theory that deeper levels of processing result in longer-lasting memory codes. Shallow encoding Processing information based on its surface characteristics. Deep encoding Processing information based on its meaning and the significance of the information. Mnemonic devices Memory aids, especially those techniques that use vivid imagery and organizational devices. Method of loci A mnemonic device that involves imagining placing items around a room or along a route. Chunking-Grouping Organizing items into familiar, manageable units; often occurs automatically. Categories-Grouping Grouping information into categories that share common attributes. Hierarchies-Grouping Organizing items into a hierarchy, starting with general categories and working down to specific examples. Spacing effect The tendency for distributed study or practice to yield better long-term retention than is achieved through massed study or practice. Massed practice Cramming information all at once. It is less effective than spaced practice. Distributed practice Spacing the study of material to be remembered by including breaks between study periods. Serial position effect Our tendency to recall best the last and first items in a list. Primacy effect The tendency to remember information at the beginning of a body of information better than the information that follows. Recency effect The tendency to remember information that is presented last. Maintenance rehearsal Repeating information over and over to keep it active in short-term memory. Elaborative rehearsal A method of transferring information from short-term to long-term memory by making that information meaningful in some way. Memory retention The ability to retain information over time through the storage and retrieval of information. Autobiographical memory The memory for events and facts related to one's personal life story. Retrograde amnesia An inability to retrieve information from one's past. Anterograde amnesia An inability to form new memories. Alzheimer's disease A progressive and irreversible brain disorder characterized by gradual deterioration of memory, reasoning, language, and, finally, physical functioning. Infantile amnesia The inability to retrieve memories from much before age 3. Recall A measure of memory in which the person must retrieve information learned earlier, as on a fill-in-the-blank test. Recognition A measure of memory in which the person need only identify items previously learned, as on a multiple-choice test. Retrieval cues Stimuli that aid the recall or recognition of information stored in memory. Context-dependent memory The theory that information learned in a particular situation or place is better remembered when in that same situation or place. Mood-congruent memory The tendency to recall experiences that are consistent with one's current good or bad mood. State-dependent memory The theory that information learned in a particular state of mind (e.g., drunk, sober) is more easily recalled when in that same state of mind. The forgetting curve A graph showing retention and forgetting over time. Encoding failure The failure to process information into memory. Proactive interference The disruptive effect of prior learning on the recall of new information. Retroactive interference The disruptive effect of new learning on the recall of old information. Tip-of-the-tongue phenomenon The temporary inability to remember something you know, accompanied by a feeling that it's just out of reach. Repression The basic defense mechanism that banishes from consciousness anxiety-arousing thoughts, feelings, and memories. Misinformation effect Incorporating misleading information into one's memory of an event. Source amnesia Attributing to the wrong source an event we have experienced, heard about, read about, or imagined. Constructive memory The process by which memories are influenced by the meaning we give to events. Memory consolidation The neural storage of a long-term memory. Imagination inflation The increased confidence in a false memory of an event following repeated imagination of the event. Health Psychology A branch of psychology that focuses on how physical activities, psychological traits, and social relationships affect overall health and illness. Stress The process by which we perceive and respond to certain events, called stressors, that we appraise as threatening or challenging. Hypertension High blood pressure, often associated with stress, which can increase the risk of heart and kidney diseases and stroke. Immune Suppression Reduction in the effectiveness of the immune system, which can be caused by various forms of stress. Stressors Events or conditions in your surroundings that may trigger stress. Daily Hassles Everyday minor events that cause stress, such as traffic jams or overwhelming chores. Significant Life Changes Major life transitions like moving, leaving a job, or divorcing, which can be stressful. Catastrophes Unpredictable, large-scale events that cause significant stress and alter the lives of many people. Eustress (motivating) Positive stress which results from striving toward a challenging goal. Distress (debilitating) Negative stress that can make a person sick or keep a person from reaching a goal. Adverse Childhood Experiences (ACEs) Potentially traumatic events that occur in childhood and can have negative, lasting effects on health and well-being. General Adaptation Syndrome (GAS) The three-stage process (alarm, resistance, exhaustion) that describes the physiological changes the body goes through when under stress. Alarm Reaction Phase The initial reaction to a stressor, activating the body's defense systems. Resistance Phase The body's response after the initial shock of a stressful event, where the body attempts to return to normal functioning. Flight-Fight-Freeze Response A physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. Exhaustion Phase The third stage of the GAS, during which the body depletes its resources in responding to a prolonged stressor. Tend-and-Befriend Theory A theory that suggests people seek social support and tend to others in times of stress. Problem-focused Coping Strategies aimed at tackling the cause of stress in practical ways which directly tackle the problem causing the stress. Emotion-focused Coping Strategies aimed at relieving or managing the emotional distress associated with stress. Positive Psychology The scientific study of human strengths and virtues that enable individuals and communities to thrive. Subjective Well-being An individual's own assessment of their happiness and satisfaction with life. Resilience The ability to mentally or emotionally cope with a crisis or to return to pre-crisis status quickly. Posttraumatic Growth Positive psychological change experienced as a result of adversity and other challenges in order to rise to a higher level of functioning. Positive Emotions Feelings that engage us, elevate us, and promote growth and well-being. Gratitude A feeling of thankfulness and appreciation, especially in response to someone doing something kind or helpful. Signature Strengths & Virtues Character strengths and virtues that are personally fulfilling, intrinsic to one's identity, and contribute to the collective well-being. Categories of Virtues Broad categories that encompass character strengths, such as wisdom, courage, humanity, justice, temperance, and transcendence. Abnormal Psychology The study of psychological disorders, including their symptoms, etiology (i.e., their causes), and treatment. Clinical Psychology A branch of psychology that studies, assesses, and treats people with psychological disorders. Psychology Student Syndrome A phenomenon where psychology students begin to believe they have the disorders they are studying. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR) The updated manual that describes and categorizes mental disorders in order to improve diagnoses, treatment, and research. International Classification of Mental Disorders (ICD) A standard diagnostic tool for epidemiology, health management, and clinical purposes. It is maintained by the World Health Organization (WHO) and covers a broad range of health conditions, including psychological conditions. Deviation In psychology, typically refers to departing from the norm, which can either be statistical, social, or functional in nature. Distress Negative stress that can lead to anxiety, depression, and potentially to physical problems. Dysfunction Abnormal functioning, as opposed to normal functioning, often used to refer to individual behaviors or the functioning of social systems. Eclectic Approach An approach to clinical practice that involves selecting the best treatment techniques from various disciplines based on the client's unique problems, strengths, and preferences. Behavioral Perspective Focuses on how we learn observable responses and how the environment impacts those responses. Psychodynamic Perspective Emphasizes the influence of the unconscious mind on behavior and the importance of childhood experiences. Humanistic Perspective Focuses on the importance of being your true self in order to lead the most fulfilling life. Cognitive Perspective Focuses on how we encode, process, store, and retrieve information. Evolutionary Perspective How the natural selection of traits promotes the perpetuation of one's genes. Sociocultural Perspective Examines how the social environments and cultural upbringing influence an individual's behavior and thoughts. Biological Perspective Explores the links between brain and mind, and how the body and brain enable emotions, memories, and sensory experiences. Biopsychosocial Model An integrated approach that incorporates biological, psychological, and social-cultural levels of analysis to better understand health and illness. Diathesis-Stress Model Suggests that a person may be predisposed for a psychological disorder that remains unexpressed until triggered by stress. Stigma Disapproval or discrimination against a person based on perceivable social characteristics that serve to distinguish them from other members of society. Anxiety Disorders Mental health disorders characterized by significant feelings of anxiety and fear. Specific Phobia An anxiety disorder characterized by irrational and persistent fear of a specific object, situation, or activity. Acrophobia Fear of heights. Arachnophobia Fear of spiders. Agoraphobia Fear of open or crowded spaces. Panic Disorder An anxiety disorder that consists of sudden, overwhelming attacks of terror. Ataque de nervios A cultural syndrome primarily seen in Latin Americans, involving symptoms of intense emotional upset, acute anxiety, fear, or anger. Social Anxiety Disorder A chronic mental health condition in which social interactions cause irrational anxiety. Taijin Kyofusho A Japanese culture-specific syndrome characterized by an intense fear that one's body, body parts, or bodily functions give others a negative impression. Generalized Anxiety Disorder An anxiety disorder in which a person is continually tense, apprehensive, and in a state of autonomic nervous system arousal. Obsessive-Compulsive Disorders Disorders involving intrusive obsessions and compulsions which impede daily life. Obsessions Persistent ideas, thoughts, or impulses that are unwanted and inappropriate and cause marked distress. Compulsions Repetitive behaviors or mental acts that an individual feels driven to perform in response to an obsession. Hoarding Disorder A disorder characterized by the persistent difficulty discarding or parting with possessions, regardless of their actual value. Trauma and Stressor-Related Disorders Disorders related to the exposure to a traumatic or stressful event. Posttraumatic Stress Disorder A disorder characterized by failure to recover after experiencing or witnessing a terrifying event. Depressive Disorders Disorders that involve the presence of sad, empty, or irritable mood, accompanied by physical and cognitive changes that significantly affect the individual's capacity to function. Major Depressive Disorder A mood disorder causing a persistent feeling of sadness and loss of interest. Persistent Depressive Disorder A form of depression that is less severe than major depressive disorder but more chronic. Bipolar Disorder A disorder associated with episodes of mood swings ranging from depressive lows to manic highs. Bipolar Cycling The process of cycling through episodes of mania and depression in bipolar disorder. Bipolar I Disorder A type of bipolar spectrum disorder characterized by the occurrence of at least one manic episode. Bipolar II Disorder A type of bipolar disorder marked by milder episodes of hypomania that alternate with periods of severe depression. Neurodevelopmental Disorders A group of conditions with onset in the developmental period, often before school age, that are characterized by developmental deficits that produce impairments of personal, social, academic, or occupational functioning. Attention-Deficit/Hyperactivity Disorder (ADHD) A chronic condition including attention difficulty, hyperactivity, and impulsiveness. Autism Spectrum Disorder (ASD) A disorder that affects communication and behavior. Feeding and Eating Disorders Disorders characterized by abnormal or disturbed eating habits, which negatively affect a person's health. Anorexia Nervosa An eating disorder characterized by an abnormally low body weight, intense fear of gaining weight, and a distorted perception of body weight. Bulimia Nervosa An eating disorder characterized by binge eating followed by purging. Schizophrenic Spectrum Disorders A range of disorders that involve psychosis, including schizophrenia. Delusions False beliefs, often of persecution or grandeur, that may accompany psychotic disorders. Delusions of Persecution The belief that others are out to get one. Delusions of Grandeur A false belief that one is more important or influential than they really are. Hallucinations False sensory experiences, such as seeing something in the absence of an external visual stimulus. Disorganized Thinking A symptom of psychosis, manifested as illogical or incoherent thought and speech. Disorganized Speech A style of talking involving incoherence and a lack of typical logical patterns. Word Salad A confused or unintelligible mixture of seemingly random words and phrases. Disorganized Motor Behavior Includes a variety of unusual behaviors including problems with goal-directed behavior leading to difficulties performing activities of daily living. Catatonia A state of unresponsiveness to one's outside environment, usually including muscle rigidity, staring, and inability to communicate. Flat Affect A lack of emotional responsiveness. Dopamine Hypothesis The theory that schizophrenia results from an excess of dopamine activity. Positive Symptoms Symptoms of schizophrenia that are excesses of behavior or occur in addition to normal behavior; hallucinations, delusions, and disorganized speech. Negative Symptoms Symptoms of schizophrenia that are marked by deficits in functioning, such as apathy, lack of emotion, and slowed speech and movement. Dissociative Disorders Disorders in which conscious awareness becomes separated (dissociated) from previous memories, thoughts, and feelings. Dissociative Amnesia A disorder characterized by the sudden and extensive inability to recall important personal information, usually of a traumatic or stressful nature. Dissociative Fugue A rare dissociative disorder in which a person loses awareness of their identity or other important autobiographical information and also engages in some form of unexpected travel. Dissociative Identity Disorder A disorder characterized by the presence of two or more distinct personality states. Personality Disorders Psychological disorders characterized by inflexible and enduring behavior patterns that impair social functioning. Cluster A Personality Disorders Odd, eccentric thinking or behavior (including paranoid, schizoid, and schizotypal personality disorders). Paranoid Personality Disorder Type of personality disorder characterized by extreme distrust and suspicion of others. Schizoid Personality Disorder A personality disorder characterized by persistent avoidance of social relationships and little expression of emotion. Schizotypal Personality Disorder A personality disorder characterized by severe social anxiety, thought disorder, paranoid ideation, derealization, transient psychosis, and often unconventional beliefs. Cluster B Personality Disorders Dramatic, overly emotional or unpredictable thinking or behavior (including antisocial, borderline, histrionic, and narcissistic personality disorders). Antisocial Personality Disorder A personality disorder characterized by a lack of conscience for wrongdoing, even toward friends and family. Histrionic Personality Disorder A personality disorder characterized by excessive emotionality and attention seeking. Narcissistic Personality Disorder A disorder in which a person has an inflated sense of self-importance. Borderline Personality Disorder A personality disorder characterized by severe instability in emotions and self-image, along with impulsive and reckless behavior. Cluster C Personality Disorders Anxious, fearful thinking or behavior, including avoidant, dependent, and obsessive-compulsive personality disorders. Avoidant Personality Disorder A personality disorder characterized by social inhibition, feelings of inadequacy, and hypersensitivity to negative evaluation. Dependent Personality Disorder A personality disorder characterized by psychological dependence on other people. Obsessive-Compulsive Personality Disorder A personality disorder characterized by preoccupation with orderliness, perfection, and control. Deinstitutionalization The release of institutionalized individuals from institutional care to community-based care. Evidence-Based Interventions Treatments based on scientific evidence. Cultural Humility An approach to engagement across cultures emphasizing openness and self-awareness of one's own cultural identities. Therapeutic Alliance The relationship between a healthcare professional and a client. Conformity Adjusting one's behavior or thinking to coincide with a group standard. Normative Social Influence Influence resulting from a person's desire to gain approval or avoid disapproval. Social Norms Expected standards of conduct, which influence behavior. Social Comparison Evaluating one's abilities and opinions by comparing oneself to others. Relative Deprivation The perception that one is worse off relative to those with whom one compares oneself. Upward Social Comparison Comparing oneself with others who are better off. Downward Social Comparison Comparing oneself with others who are worse off. Informational Social Influence Influence resulting from one's willingness to accept others' opinions about reality. Obedience Following the directives of authority. Social Facilitation Improved performance on simple or well-learned tasks in the presence of others. Group Polarization The enhancement of a group's prevailing inclinations through discussion within the group. Groupthink The mode of thinking that occurs when the desire for harmony in a decision-making group overrides a realistic appraisal of alternatives. Bystander Effect The tendency for any given bystander to be less likely to give aid if other bystanders are present. Diffusion of Responsibility Diminished sense of responsibility among group members to act because others are seen as equally responsible. Social Loafing The tendency for people in a group to exert less effort when pooling their efforts toward attaining a common goal than when individually accountable. Deindividuation The loss of self-awareness and self-restraint occurring in group situations that foster arousal and anonymity. Attribution Theory The theory that we explain someone's behavior by crediting either the situation or the person's disposition. Dispositional Attributions Attributing behavior to the person's disposition and traits. Situational Attributions Attributing behavior to the environment. Explanatory Style A person's habitual way of explaining events, typically assessed along three dimensions: internal/external, stable/unstable, and global/specific. Optimistic Explanatory Style Explaining bad events as results of temporary, external causes. Pessimistic Explanatory Style Explaining bad events as results of stable, internal causes. Fundamental Attribution Error The tendency for observers, when analyzing others' behavior, to underestimate the impact of the situation and to overestimate the impact of personal disposition. Actor-Observer Bias The tendency to attribute one's own actions to external causes while attributing other people's behaviors to internal causes. Self-Serving Bias A readiness to perceive oneself favorably. Internal Locus of Control The perception that one controls one's own fate. External Locus of Control The perception that chance or outside forces beyond one's personal control determine one's fate. Altruism Unselfish regard for the welfare of others. Social Responsibility Norm An expectation that people will help those needing their help. Stereotype A generalized belief about a group of people. Confirmation Bias The tendency to interpret new evidence as confirmation of one's existing beliefs or theories. Belief Perseverance Clinging to one's initial conceptions after the basis on which they were formed has been discredited. Self-Fulfilling Prophecy A belief that leads to its own fulfillment. Prejudice An unjustifiable and usually negative attitude toward a group and its members. Discrimination Unjustifiable negative behavior toward a group and its members. Implicit Attitudes Attitudes that influence a person's feelings and behavior at an unconscious level. Just-World Phenomenon The tendency for people to believe the world is just and that people therefore get what they deserve. Out-Group Homogeneity Bias Perception of out-group members as more similar to one another than are in-group members. In-Group Bias The tendency to favor one's own group. Mere Exposure Effect The phenomenon that repeated exposure to novel stimuli increases liking of them. Ethnocentrism Evaluating other cultures according to the standards and customs of one's own culture. Collectivism Giving priority to the goals of one's group and defining one's identity accordingly. Multiculturalism The practice of valuing and respecting differences in culture. Superordinate Goals Shared goals that override differences among people and require their cooperation. Social Traps A situation in which conflicting parties, by each rationally pursuing their self-interest, become caught in mutually destructive behavior. Persuasion The process of creating, reinforcing, or changing people's beliefs or actions. Elaboration Likelihood Model A theory of how persuasive messages lead to attitude changes. Central Route of Persuasion Attitude change path in which interested people focus on the arguments and respond with favorable thoughts. Peripheral Route of Persuasion Attitude change path in which people are influenced by incidental cues, such as a speaker's attractiveness. Halo Effect The tendency to draw a general impression about an individual on the basis of a single characteristic. Foot-in-the-Door Technique The tendency for people who have first agreed to a small request to comply later with a larger request. Door-in-the-Face Technique The strategy of getting someone to agree to a modest request by first asking them to agree to a much larger request that they will likely turn down. False Consensus Effect The tendency to overestimate the extent to which others share our beliefs and behaviors. Cognitive Dissonance The theory that we act to reduce the discomfort we feel when two of our thoughts are inconsistent. Industrial-Organizational (I/O) Psychologists Psychologists who apply psychology's principles to the workplace. Instincts A complex behavior that is rigidly patterned throughout a species and is unlearned. Drive-Reduction Theory The idea that a physiological need creates an aroused tension state (a drive) that motivates an organism to satisfy the need. Homeostasis The tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level. Ghrelin Hormone secreted by an empty stomach; sends 'I'm hungry' signals to the brain. Leptin Hormone secreted by fat cells; when abundant, causes brain to increase metabolism and decrease hunger. Hypothalamus A neural structure lying below the thalamus; directs several maintenance activities (eating, drinking, body temperature), helps govern the endocrine system via the pituitary gland, and is linked to emotion and reward. Pituitary Gland The endocrine system's most influential gland. Under the influence of the hypothalamus, the pituitary regulates growth and controls other endocrine glands. Belongingness The human emotional need to be an accepted member of a group. Arousal Theory The theory that people are motivated to maintain an optimal level of alertness and physical and mental activation. Yerkes-Dodson Law The principle that performance increases with arousal only up to a point, beyond which performance decreases. Sensation-Seeking Theory The search for experiences and feelings that are varied, novel, complex, and intense. Thrill Seeking Pursuing activities that provide a rush of adrenaline. Adventure Seeking Engaging in unusual and exciting activities. Disinhibition Acting impulsively, without considering the consequences. Boredom Susceptibility Tendency to experience boredom and frustration when not engaged in stimulating activities. Incentive Theory A theory that states that behavior is motivated by a desire for reinforcement or incentives. Extrinsic Motivation A desire to perform a behavior to receive promised rewards or avoid threatened punishment. Self-Determination Theory A theory of motivation that is concerned with the beneficial effects of intrinsic motivation and the harmful effects of extrinsic motivation. Intrinsic Motivation A desire to perform a behavior effectively for its own sake. Lewin's Motivational Conflicts Theory A theory that describes situations in which conflicting motivations produce indecision and difficulty. Approach-Approach Conflicts Conflict that results from having to choose between two attractive alternatives. Avoidance-Avoidance Conflicts Conflict that results from having to choose between two distasteful alternatives. Approach-Avoidance Conflicts Conflict that results when a single action or event has both attractive and unattractive features. Emotion A response of the whole organism, involving (1) physiological arousal, (2) expressive behaviors, and (3) conscious experience. Affect A broad range of feelings that people experience. Facial-Feedback Hypothesis The idea that facial expressions can influence emotions as well as reflect them. Display Rules Culturally determined rules about which nonverbal behaviors are appropriate to display. Elicitors Stimuli that trigger emotional responses. Broaden-and-Build Theory of Emotion Theory proposing that happiness predisposes us to think more openly. Universal Emotions Basic emotions that are expressed by all cultures around the world such as happiness, sadness, fear, disgust, anger, and surprise. Psychodynamic Theory A view that explains personality in terms of conscious and unconscious forces, such as unconscious desires and beliefs. Preconscious Mind The level of consciousness that is not currently in focal awareness. Unconscious Mind A reservoir of mostly unacceptable thoughts, wishes, feelings, and memories. Denial Psychoanalytic defense mechanism by which people refuse to believe or even to perceive painful realities. Displacement Defense mechanism that shifts sexual or aggressive impulses toward a more acceptable or less threatening object or person. Projection Defense mechanism by which people disguise their own threatening impulses by attributing them to others. Rationalization Defense mechanism that offers self-justifying explanations in place of the real, more threatening, unconscious reasons for one's actions. Reaction Formation Defense mechanism by which the ego unconsciously switches unacceptable impulses into their opposites. Regression Defense mechanism in which an individual faced with anxiety retreats to a more infantile psychosexual stage. Repression Defense mechanism by which anxiety-provoking thoughts and feelings are forced to the unconscious. Sublimation Defense mechanism by which people re-channel their unacceptable impulses into socially approved activities. Humanistic Psychology A historically significant perspective that emphasized the growth potential of healthy people. Unconditional Regard An attitude of total acceptance toward another person. Self-Actualizing Tendency The human motive toward realizing our inner potential. Social-Cognitive Theory Views behavior as influenced by the interaction between people's traits (including their thinking) and their social context. Reciprocal Determinism The interacting influences of behavior, internal cognition, and environment. Self-Concept All our thoughts and feelings about ourselves, in answer to the question, 'Who am I?' Self-Efficacy One's sense of competence and effectiveness. Self-Esteem One's feelings of high or low self-worth. Trait Theories Theories that endeavor to describe the characteristics that make up human personality in an effort to predict future behavior. Big Five Theory The theory that there are five basic personality traits: openness, conscientiousness, extraversion, agreeableness, and neuroticism (emotional stability). Personality Inventories A questionnaire (often with true-false or agree-disagree items) on which people respond to items designed to gauge a wide range of feelings and behaviors; used to assess selected personality traits. Factor Analysis A statistical procedure that identifies clusters of related items (called factors) on a test; used to identify different dimensions of performance that underlie one's total score. Openness to Experience One of the five factors; willingness to try new things and be open to new experiences. Conscientiousness One of the five factors; a tendency to show self-discipline, act dutifully, and aim for achievement. Extraversion One of the five factors; energy, positive emotions, and the tendency to seek stimulation and the company of others. Agreeableness One of the five factors; a tendency to be compassionate and cooperative rather than suspicious and antagonistic towards others. Behavioral Perspective Emphasizes learning and behavior in explaining thoughts, feelings, and actions. Associative Learning Making connections between events to learn. Habituation Becoming less responsive to a repeated stimulus. Classical Conditioning Pairing two stimuli to elicit a response. Unconditioned Stimulus (UCS) Naturally triggers a response without learning. Conditioned Stimulus (CS) Initially neutral, triggers a conditioned response. Acquisition Initial learning stage where a response is established. Extinction Diminishing of a conditioned response. Spontaneous Recovery Reappearance of an extinguished response after a pause. Stimulus Discrimination Ability to differentiate between stimuli. Stimulus Generalization Conditioned stimulus evokes similar responses. Higher-Order Conditioning Pairing a conditioned stimulus with a new one. Counterconditioning Uses conditioning to change responses to triggers. Taste Aversion Avoidance of food associated with discomfort. One-Trial Conditioning Learning with only one pairing of stimulus and response. Biological Preparedness Inclination to form associations between stimuli and responses. Operant Conditioning Learning through rewards and punishments. The Law of Effect Behaviors with favorable consequences are repeated. Reinforcement Strengthens behavior it follows. Primary Reinforcers Innately reinforcing stimuli satisfying biological needs. Secondary Reinforcers Gains reinforcing power through association. Punishment Event decreasing behavior it follows. Shaping Positive reinforcement of behavior patterns. Instinctive Drift Tendency to revert to instinctive behaviors. Fine Motor Coordination The ability to make small, precise movements, typically involving the coordination of the hands and fingers with the eyes. Gross Motor Coordination The ability to make large, general movements, such as crawling and walking. Maturation Biological growth processes that enable orderly changes in behavior, relatively uninfluenced by experience. Reflexes Automatic responses to sensory stimuli, like grasping a finger tightly with the hands. Rooting Reflex A baby's tendency, when touched on the cheek, to turn toward the touch, open the mouth, and search for the nipple. Visual Cliff A laboratory device for testing depth perception in infants and young animals. Critical Periods Specific time periods during which an organism must experience stimuli in order to develop normally. Sensitive Periods Times in development when a person is particularly open to certain kinds of experiences. Imprinting The process by which certain animals form strong attachments during early life. Growth Spurt A rapid increase in growth during puberty. Puberty The period of sexual maturation, during which a person becomes capable of reproducing. Primary Sex Characteristics The body structures (ovaries, testes, and external genitalia) that make sexual reproduction possible. Secondary Sex Characteristics Nonreproductive sexual traits, such as female breasts and hips, male voice quality, and body hair. Menarche The first menstrual period. Spermarche The first ejaculation. Menopause The time of natural cessation of menstruation; also refers to the biological changes a woman experiences as her ability to reproduce declines. Sex The biologically influenced characteristics by which people define males and females. Gender The socially influenced characteristics by which people define men and women. Socialization The process by which people learn the norms, rules, and information of a culture or society. Jean Piaget A psychologist known for his study of cognitive development in children. Sensorimotor Stage The first stage in Piaget's theory of cognitive development, from birth to about 2 years of age, during which infants know the world mostly in terms of their sensory impressions and motor activities. Object Permanence The awareness that things continue to exist even when not perceived. Preoperational Stage The second stage in Piaget's theory, from about 2 to 7 years of age, during which a child learns to use language but does not yet comprehend the mental operations of concrete logic. Mental Symbols Internal depictions of information that the mind can manipulate. Chronosystem In Bronfenbrenner's theory, this system encompasses changes over time in child development. Authoritarian Parenting A parenting style characterized by high demands and low responsiveness. Parents with this style have very high expectations of their children, yet provide very little in the way of feedback and nurturance. Authoritative Parenting A parenting style characterized by high demands and high responsiveness. Parents with this style set limits and enforce rules but also listen to their children. Permissive Parenting A parenting style characterized by low demands with high responsiveness. These parents tend to be very loving, yet provide few guidelines and rules. Attachment Styles Patterns of attachment, defined by different ways of interacting and behaving in relationships. Secure Attachment An attachment style characterized by trust, a lack of concern with being abandoned, and the view that one is worthy and well liked. Insecure Attachment Attachment styles characterized by fear of abandonment and the feeling that one's needs might not be met. Avoidant Attachment An attachment style characterized by difficulty in learning to trust others. Anxious Attachment An attachment style where individuals are often anxious about the stability of their relationships. Disorganized Attachment An attachment style characterized by a lack of clear attachment behavior. Temperament A person's characteristic emotional reactivity and intensity. Separation Anxiety Emotional distress seen in many infants when they are separated from people with whom they have formed an attachment. Contact Comfort The physical and emotional comfort that an infant receives from being in physical contact with its mother. Parallel Play Activity in which children play side by side without interacting. Pretend Play Play involving imaginary people and situations; also called fantasy play, dramatic play, or imaginative play. Egocentrism The inability to differentiate between self and other. More specifically, it is the inability to understand that others have different feelings, desires, and perspectives from one's own. Imaginary Audience A concept in adolescent psychology where an individual believes that his or her behavior is the main focus of others' attention and concern. Personal Fable An adolescent's belief that they are unique and protected from harm. Social Clock The culturally preferred timing of social events such as marriage, parenthood, and retirement. Emerging Adulthood A phase of the life span between adolescence and full-fledged adulthood which encompasses late adolescence and early adulthood, generally ages 18 to 25. Stage Theory of Psychosocial Development (Erikson) Erik Erikson's theory that identifies eight stages through which a healthily developing human should pass from infancy to late adulthood. Trust vs. Mistrust The first stage of Erik Erikson's theory of psychosocial development. This stage occurs between birth and approximately 18 months of age. During this stage, the infant learns if they can trust the world to fulfill their needs. Autonomy vs. Shame and Doubt The second stage of Erik Erikson's stages of psychosocial development. This stage occurs between the ages of 18 months to approximately 3 years. The child learns to be independent and confident or experiences shame and doubt about their abilities. Initiative vs. Guilt The third stage of Erik Erikson's stages of psychosocial development. This stage occurs during the preschool years, between the ages of 3 to 5 years. Children begin to assert control and power over their environment. Industry vs. Inferiority The fourth stage of Erik Erikson's stages of psychosocial development. This stage occurs between the ages of 5 and 12 years. Children learn to cope with new social and academic demands, success leads to a sense of competence, while failure results in feelings of inferiority. Identity vs. Role Confusion The fifth stage of Erik Erikson's stages of psychosocial development. This stage occurs during adolescence, from about 12-18 years. During this stage, adolescents explore their independence and develop a sense of self. Intimacy vs. Isolation The sixth stage of Erik Erikson's theory of psychosocial development. This stage occurs during young adulthood between the ages of approximately 19 and 40 years. Young adults need to form intimate, loving relationships with other people. Generativity vs. Stagnation The seventh stage of Erik Erikson's theory of psychosocial development. This stage takes place during middle adulthood between the ages of approximately 40 and 65. Individuals establish careers, settle down within relationships, begin families, and develop a sense of being a part of the bigger picture. Integrity vs. Despair The eighth and final stage of Erik Erikson's stages of psychosocial development. This stage occurs during old age and is focused on reflecting back on life. Adverse Childhood Experiences (ACEs) Potentially traumatic events that occur in childhood (0-17 years), such as experiencing violence, abuse, or neglect, witnessing violence in the home or community, and having a family member attempt or die by suicide. Achievement (adolescent development) In the context of identity development, this term refers to the successful integration of various aspects of self-concept, based on explorations of roles, values, and beliefs. Diffusion (adolescent development) A status of identity development where an individual has not yet experienced a crisis or made any commitments. They are undecided and uninterested in occupational and ideological choices. Foreclosure (adolescent development) A status of identity development where an individual has made a commitment without experiencing a crisis. This occurs when people commit to roles or values without exploring alternatives. Moratorium (adolescent development) A status of identity development where an individual is in the midst of a crisis but whose commitments are either absent or are only vaguely defined. Racial/Ethnic Identity An individual's awareness and experience of being a member of a racial or ethnic group, including the degree to which one's cultural, historical, and social aspects of identity are embraced. Sexual Orientation An inherent or immutable enduring emotional, romantic, or sexual attraction to other people. Religious Identity An individual's sense of belonging to a religious group, along with the importance of this group membership as it pertains to one's sense of self. Occupational Identity How a person identifies themselves based on their job or career choices and how they feel those roles impact their personal identity. Familial Identity The part of an individual's identity that is formed by the relationships they have with their family members. Possible Selves The aspect of oneself that includes all the ideas of what one might become, what one hopes to become, and what one is afraid of becoming. Evolutionary Perspective A way of looking at human behavior that emphasizes the role of natural selection and survival of the fittest in shaping our actions. Natural Selection A process where organisms better adapted to their environment tend to survive and produce more offspring. Nature Refers to the genetic or hereditary influences on behavior and traits. Nurture Refers to the environmental influences that shape behavior and traits after conception. Twin Studies Research that compares the similarities between identical and fraternal twins to understand the influence of genetics versus environment. Adoption Studies Studies that compare adopted children to their adoptive and biological parents to understand genetic and environmental influences. Family Studies Research that examines behavioral patterns or genetic markers across generations within families. Heredity The passing on of physical or mental traits genetically from one generation to another. Genetic Predisposition The increased likelihood of developing a particular disease or behavior based on a person's genetic makeup. Eugenics A controversial historical movement aimed at improving the genetic composition of the human race. Cerebral Cortex The outermost layer of the brain involved in high-level functions such as thought, language, and memory. Association Areas Parts of the brain that integrate different types of information from the senses and link it with stored memories. Lobes of the Brain Regions of the brain differentiated by their functions, including frontal, parietal, occipital, and temporal lobes. Frontal Lobes Areas of the brain involved in complex processes like reasoning, planning, and emotion. Prefrontal Cortex The part of the frontal lobes directly behind the forehead, involved in decision-making and self-control. Executive Functioning Higher-level cognitive processes including thinking, planning, and problem-solving. Motor Cortex The part of the brain that controls voluntary movements. Parietal Lobes Areas of the brain that process sensory information such as touch, temperature, and pain. Somatosensory Cortex A part of the parietal lobes that processes sensory input from various body areas. Occipital Lobes The part of the brain that processes visual information. Temporal Lobes Areas of the brain involved in processing auditory information and encoding memory. Corpus Callosum A large band of neural fibers that connects the left and right cerebral hemispheres and allows communication between them. Brainstem The central trunk of the brain continuing downward to form the spinal cord. Medulla The base of the brainstem that controls vital life-sustaining functions like heartbeat and breathing. Reticular Activating System A network of neurons in the brainstem that plays a role in waking and sleep. Cerebellum A part of the brain at the back of the skull that coordinates and regulates muscular activity. Limbic System A complex system of nerves and networks in the brain, controlling basic emotions and drives. Reward Center Brain regions that regulate the experience of pleasure, particularly related to survival and reward. Thalamus A structure deep within the brain that relays sensory signals to the cerebral cortex. Hypothalamus A small region at the base of the brain that directs several functions, including temperature regulation and energy maintenance. Pituitary Gland A gland at the base of the brain that controls growth and development. Hippocampus A part of the limbic system involved in learning and memory. Amygdala A structure in the limbic system involved in emotion, particularly fear and aggression. Nervous System The network of nerve cells and fibers that transmits nerve impulses between parts of the body. Central Nervous System The part of the nervous system consisting of the brain and spinal cord. Peripheral Nervous System All the nerves that lie outside the brain and spinal cord. Autonomic Nervous System The part of the nervous system responsible for control of the bodily functions not consciously directed, like breathing and the heartbeat. Sympathetic Nervous System The part of the autonomic nervous system that prepares the body for rapid action in emergencies. Parasympathetic Nervous System The part of the autonomic nervous system that calms the body and conserves energy. Somatic Nervous System The part of the peripheral nervous system associated with voluntary control of body movements via skeletal muscles. Neurons The basic working units of the brain, specialized cells that transmit information to other nerve cells, muscle, or gland cells. Glial Cells Cells in the nervous system that support, nourish, and protect neurons. Motor Neurons Neurons that carry outgoing information from the brain and spinal cord to the muscles and glands. Sensory Neurons Neurons that carry incoming information from the sensory receptors to the brain and spinal cord. Interneurons Neurons within the brain and spinal cord that communicate internally and intervene between the sensory inputs and motor outputs. Reflex Arc A neural pathway that controls a reflex action. Neural Transmission The process by which neurons communicate with each other by sending electrical or chemical signals. Threshold The level of stimulation required to trigger a neural impulse. Action Potential A neural impulse; a brief electrical charge that travels down an axon. All-or-Nothing Principle The rule that neurons are either on or off. Depolarization A change in a cell's membrane potential, making it more positive. Refractory Period A period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation. Resting Potential The state of the neuron when not firing a neural impulse. Reuptake A neurotransmitter's reabsorption by the sending neuron. Multiple Sclerosis (MS) A disease in which the immune system eats away at the protective covering of nerves. Myasthenia Gravis A chronic autoimmune disease that affects the neuromuscular junction and produces serious weakness of voluntary muscles. Neurotransmitters Chemicals transmitting information across synapses to dendrites of receiving neurons. Excitatory Neurotransmitters Chemical messengers increasing the likelihood of neuron firing an action potential. Glutamate An excitatory neurotransmitter strengthening synaptic connections between neurons. Inhibitory Neurotransmitters Chemical messengers decreasing the likelihood of neuron firing an action potential. GABA A major inhibitory neurotransmitter in the brain. Dopamine A neurotransmitter influencing movement, learning, attention, and emotion. Serotonin A neurotransmitter affecting mood, hunger, sleep, and arousal. Endorphins Neurotransmitters influencing the perception of pain or pleasure. Substance P A neurotransmitter involved in transmitting pain messages to the brain. Acetylcholine A neurotransmitter enabling learning, memory, and triggering muscle contraction. Hormones Chemicals produced by glands regulating activities of different body cells. Ghrelin A hormone stimulating appetite, increasing food intake, and promoting fat storage. Leptin A hormone helping regulate energy balance by inhibiting hunger. Melatonin A hormone regulating sleep-wake cycles. Oxytocin A hormone acting as a neurotransmitter, influencing social behavior and emotion. Adrenaline A hormone released in response to physical or mental stress. Norepinephrine A hormone and neurotransmitter involved in arousal and fight-or-flight response. Plasticity The brain's ability to change and adapt due to experience. Split Brain Research Studies on patients with severed corpus callosum to understand brain hemisphere functions. Contralateral Hemispheric Organization Arrangement where the brain's right hemisphere controls the left side of the body and vice versa. Hemispheric Specialization Control of distinct functions by the brain's right and left hemispheres. Linguistic Processing Brain functions involved in understanding and producing language. Broca's Area Frontal lobe area directing muscle movements involved in speech. Broca's Aphasia Condition from damage to Broca's area causing impaired speaking and writing. Opioids A class of drugs including heroin and prescription pain relievers. Heroin An opioid drug made from morphine, derived from opium poppy plants. Tolerance Diminishing drug effect with regular use, necessitating larger doses. Addiction Compulsive craving for drugs or behaviors despite adverse consequences. Withdrawal Symptoms post cessation of drug intake in addicted individuals. Sensation Reception and representation of stimulus energies by sensory receptors. Transduction Conversion of stimulus energies into neural impulses in sensation. Perception Organization and interpretation of sensory information for object recognition. Absolute Threshold Minimum stimulus energy to detect a stimulus 50% of the time. Just-noticeable Difference Smallest difference in stimulus intensity detectable by a sense. Sensory Adaptation Decrease in sensitivity to constant stimulation levels. Weber's Law Principle that stimuli must differ by a constant proportion for detection. Synesthesia Condition where one sense is perceived as if by additional senses. Retina Light-sensitive eye surface with rods, cones, and neural processing layers. Blind Spot Point where optic nerve exits the eye, lacking receptor cells. Visual Nerve Nerve transmitting neural impulses from the eye to the brain. Lens Transparent eye structure behind the pupil, aiding image focus. Accommodation Process of lens shape change for focusing on near or far objects. Nearsightedness Clear vision for close objects but blurry for distant ones. Farsightedness Clear vision for distant objects but blurry for close ones. Photoreceptors Rods and cones in the retina converting light into neural signals. Rods Photoreceptors detecting black, white, and gray for peripheral vision. Cones Photoreceptors concentrated for daylight vision, color, and detail. Trichromatic Theory Theory of three color receptors in the retina for color perception. Opponent-process Theory Theory of opposing processes in color vision enabling perception. Psychology the scientific study of mental processes and behavior. Mental Processes Thoughts, feelings, and motives that each of us experiences privately but that cannot be directly observed. Behavior Any action that people can observe or measure Confirmation Bias The tendency to favor information that confirms your existing beliefs. Hindsight Bias The feeling after something happens that you knew it was going to happen. Overconfidence Being more confident than correct; overestimating the accuracy of your beliefs. Empirical Evidence Information from experiments or observations rather than theories. Scientific Method A step-by-step method for conducting research. Hypothesis A prediction that you can test through study and experimentation. Falsifiable Something that can be proven wrong through tests. Peer Review The process of having other experts examine your work to check its validity. Replication Repeating a study to see if the same results are obtained. Reliability The consistency of a research study or measuring test. Validity The accuracy of a test or research to measure what it claims to measure. The American Psychological Association (APA) A major organization for psychologists in the United States. Research Design The plan for a research study, determining how to collect and analyze data. Methodology The specific procedures or techniques used to identify, select, process, and analyze information about a topic. Quantitative Data Data that can be counted or measured and given a numerical value. Qualitative Data Data that describes qualities or characteristics. Likert Scales A scale used to represent people's attitudes or feelings; respondents specify their level of agreement to a statement. Structured Interviews Interviews where everyone is asked the same questions in the same way. Survey Technique A method of gathering information by asking questions to people. Wording Effect How the way a question is phrased can influence the answers given. Social Desirability Bias: The tendency of respondents to answer questions in a manner that will be viewed favorably by others. Naturalistic Observation Watching behaviors occur naturally without interfering. Case Study A detailed examination of a single subject or group. Correlational Research A study that investigates the relationship between two variables to determine if they vary together. Third Variable Problem A situation where an unseen variable affects the results of a study. Scatterplot A graph in which the values of two variables are plotted along two axes, the pattern of the resulting points revealing any correlation present. Correlation Coefficient A number between -1 and 1 that describes the strength and direction of a relationship between variables. Positive Correlation A relationship where if one variable increases, the other does too. Negative Correlation A relationship where if one variable increases, the other decreases. Experimental Method: A method where the researcher manipulates one variable to see if it affects another. Independent Variable The variable that is changed or controlled in a scientific experiment. Dependent Variable The variable that is tested and measured in a scientific experiment. Confounding Variable An extra variable that wasn't accounted for that could affect the results of an experiment. Operational Definitions Clearly defining how you will measure your variables in research. Experimental Group The group in an experiment that receives the variable being tested. Control Group The group in an experiment that does not receive the test variable. Random Assignment Assigning participants to experimental and control groups by chance, which helps ensure that any differences observed after the treatment are due to the treatment and not a preexisting difference. Placebo Effect A change in a participant's illness or behavior that results from a belief that the treatment will have an effect, rather than the actual treatment. Experimenter Bias When a researcher's expectations influence the outcome of a study. Single-Blind Study When the participants do not know whether they are receiving the treatment or not. Double-Blind Study When neither the participants nor the researchers know who is receiving a particular treatment. Placebo Condition A condition in which participants receive a placebo instead of the actual treatment. Sample A group of subjects selected from a larger population for study. Representative Sample: A randomly chosen sample of subjects from a larger population that accurately reflects the characteristics of the larger population. Random Sample A sample that fairly represents a population because each member has an equal chance of being included. Sample Bias A sample that does not accurately represent the population from which it was drawn. Generalizability The extent to which research findings can be applied to larger populations. Statistics The science of collecting, analyzing, presenting, and interpreting data. Descriptive Statistics Statistics that summarize data, such as mean or standard deviation Inferential Statistics: Statistics used to infer the properties of a population, based on a sample of data. Measure of Central Tendency: A statistical measure that describes the center of a data set; includes mean, median, and mode. Mean The average of a set of numbers. Median The middle number in a set of numbers arranged in order. Mode The number that appears most frequently in a data set. Range The difference between the highest and lowest values in a data set. Normal Curve A bell-shaped curve that shows data distribution; most scores fall near the middle. Regression to the Mean The phenomenon that extreme values in data tend to be closer to the average on subsequent measurements. Positive Skew When more scores fall on the low side of the scale and tail on the high side. Negative Skew When more scores fall on the high side of the scale and tail on the low side. Standard Deviation A measure of how spread out numbers are around the mean. Percentile Rank The percentage of scores in a distribution that a specific score is greater than. Bimodal Distribution A distribution of data with two modes or peaks. Statistical Significance The likelihood that a result from data collected by an experiment is not due to chance. Effect Sizes A measure of the strength of the relationship between two variables. Meta Analysis A method of combining data from many different research studies. Institutional Review Boards (IRB) Groups of people responsible for reviewing proposed research to ensure that it is ethical. Informed Consent Permission granted in the knowledge of the possible consequences, typically that which is given by a patient to a doctor for treatment with full knowledge of the possible risks and benefits. Informed Assent Agreement by a minor or other not able to give legal consent to participate in the activity. Confidentiality Keeping information given by participants in a research study private. Deception Misleading participants about the true purpose of a study or the events that will transpire. Confederates Actors who take part in a study pretending to be real participants. Debriefing Explaining to participants at the end of a study the true purpose of the study and exactly what transpired.

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