AP Psychology Final Exam Study Guide (2025) EXAMPLES
Unit 1, Part II: Research Methods
Research Methods – Systematic approaches used to investigate psychological phenomena. For example, surveying students about their stress levels before exams is a descriptive research method used to gather self-reported data on attitudes, beliefs, or behaviors.
Correlation Coefficient – A statistical measure, denoted by r, that indicates the strength and direction of a linear relationship between two variables. For example, a higher screen time linked with lower sleep hours suggests a negative correlation, but does not imply causation.
Empirical Evidence – Information acquired by observation or experimentation. Measuring reaction times in a laboratory experiment provides empirical evidence, as it is directly observable and quantifiable data collected under controlled conditions.
Ethical Considerations – Principles that guide psychological research to protect participants' welfare. Participants are told they can quit a study at any time (right to withdraw) to ensure their autonomy and voluntary consent; other considerations include informed consent, confidentiality, and debriefing.
Experimental Group – In an experiment, the group that receives the treatment or manipulation of the independent variable. Students who drink caffeine before taking a test form the experimental group, as they are exposed to the experimental condition.
Control Group – In an experiment, the group that does not receive the treatment and is used as a baseline for comparison. Students who drink water before taking the same test serve as the control group, allowing researchers to isolate the effect of caffeine.
Generalizability – The extent to which findings from a study can be applied to a larger population or different settings. When results apply to students from many different schools, the study demonstrates high generalizability, meaning its conclusions are broadly applicable.
Independent Variable – The variable that is manipulated or changed by the researcher; it's the presumed cause. The amount of sleep given to participants is the independent variable, as it is systematically controlled by the experimenter.
Dependent Variable – The variable that is measured in an experiment; it's the presumed effect. Test scores after different sleep amounts are the dependent variable, as they are expected to change in response to the independent variable.
Illusory Correlation – The perception of a relationship between two variables when only a minor or no relationship actually exists. Believing that rainy days cause bad moods is an illusory correlation; while they might sometimes coincide, a direct causal link is often overstated based on selective attention to confirming instances.
Measures of Central Tendency – Statistics that represent the typical or central value of a dataset. Finding the average (mean), median (middle score), or mode (most frequent score) on an exam are all measures of central tendency, summarizing the performance of the group.
Measures of Variability – Statistics that describe how spread out or dispersed the data points are. Comparing how spread out class scores are using range or standard deviation are measures of variability, indicating the diversity of scores around the average.
Random Assignment – A procedure in which participants are assigned to experimental or control groups randomly. Flipping a coin to decide group placement ensures that each participant has an equal chance of being in any group, minimizing pre-existing differences between groups and reducing confounding variables.
Random Sample – A sample in which every member of the population has an equal chance of being selected. Selecting names randomly from a school list creates a random sample, which helps ensure the sample is representative of the larger student population.
Reliability – The consistency of a research study or measuring test. A personality test giving similar results each time a person takes it demonstrates high reliability, meaning it produces stable and consistent measurements.
Validity – The extent to which a test or experiment measures what it is intended to measure. A math test accurately measuring math ability indicates high validity, ensuring the test is truly assessing the intended construct, not something else entirely.
Sampling Bias – A systematic error in the selection of a sample that results in an unrepresentative sample. Surveying only athletes about physical fitness creates a sampling bias because this group is not representative of the general population's fitness levels, leading to skewed results.
Standard Deviation – A measure of the average distance between each score and the mean in a data set. If most scores are close to the class average, the standard deviation is small, indicating that the data points are clustered tightly around the mean.
Statistical Significance – A finding that indicates the likelihood that the observed results occurred by chance is very low (typically p < 0.05). A study showing results unlikely due to chance indicates statistical significance, suggesting that the independent variable had a real effect.
Unit 2, Part I: Biological Bases of Behavior
Agonists – Drugs that mimic the effects of a neurotransmitter by binding to its receptor and producing a similar response. Morphine reduces pain similarly to natural endorphins by acting as an agonist at opioid receptors.
Antagonists – Drugs that block or inhibit the normal effects of a neurotransmitter by binding to its receptor sites and preventing the neurotransmitter from binding. Naloxone blocks the effects of heroin by occupying the opioid receptors, preventing heroin from binding and reversing its effects.
Brain Lateralization – The specialization of function in each hemisphere of the brain. Speech processed mainly in the left hemisphere is an example of brain lateralization, as language functions are predominantly localized there.
Cerebellum – A structure located at the rear of the brainstem that plays a crucial role in coordinating voluntary movements, balance, and motor learning. Maintaining balance while riding a skateboard heavily relies on the cerebellum.
Frontal Lobe – The largest lobe of the brain, located at the front, involved in planning, decision-making, personality, voluntary movement, and higher cognitive functions. Deciding what to say during a debate involves the frontal lobe's executive functions.
Parietal Lobe – Located behind the frontal lobe, responsible for processing sensory information such as touch, temperature, pain, and spatial awareness. Feeling a tap on your shoulder involves the somatosensory cortex located in the parietal lobe.
Occipital Lobe – Located at the back of the brain, primarily responsible for processing visual information. Recognizing a stop sign relies on the occipital lobe, which contains the primary visual cortex.
Temporal Lobe – Located below the parietal and frontal lobes, involved in auditory processing, memory, and language comprehension. Understanding spoken language activates Wernicke's area, typically found in the left temporal lobe.
Endorphins – Natural, opiate-like neurotransmitters linked to pain control and pleasure. Feeling pleasure after intense exercise ("runner's high") is often attributed to the release of endorphins.
Fight-or-Flight Response – A physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. An increased heart rate, dilated pupils, and quickened breathing during a near accident are components of the fight-or-flight response, orchestrated by the sympathetic nervous system.
Genetics of Identical Twins – Identical (monozygotic) twins share nearly 100% of their genes, making them valuable for studying the relative contributions of heredity and environment. Twins raised apart sharing similar personalities suggests a strong genetic component to personality traits.
Hemispheric Specialization – Refers to the differing functions of the left and right hemispheres of the brain. While the left hemisphere is dominant for language and logic, the right hemisphere is often associated with spatial reasoning, facial recognition, and artistic abilities, such as drawing.
Hippocampus – A neural center located in the limbic system that helps process explicit (conscious) memories for storage. Remembering your first day of high school is an example of episodic memory, heavily reliant on the hippocampus for its formation.
Limbic System – A system of neural structures located below the cerebral hemispheres, associated with emotions, motivation, and memory. Feeling fear during a scary movie involves structures like the amygdala (emotion) and hippocampus (memory) within the limbic system.
Parts of a Neuron – The basic building blocks of the nervous system, transmitting electrical and chemical signals. An electrical signal travels down the axon (long projection) of a neuron, moving from the dendrites toward the axon terminals, where neurotransmitters are released.
Spinal Reflexes – Simple, automatic responses to sensory stimuli that involve only the spinal cord, without input from the brain. Pulling your hand away from a hot stove without conscious thought is a spinal reflex, allowing for a rapid protective response.
Sympathetic Nervous System – A division of the autonomic nervous system that arouses the body, mobilizing its energy in stressful situations (fight-or-flight). Sweating, increased heart rate, and heightened alertness before a big test are signs of the sympathetic nervous system's activation.
Parasympathetic Nervous System – A division of the autonomic nervous system that calms the body, conserving its energy (rest and digest). Slowing heart rate, decreasing breathing, and promoting digestion after the test are functions of the parasympathetic nervous system.
Wernicke’s Area – A brain area, typically in the left temporal lobe, involved in language comprehension and expression. Understanding a teacher’s lecture relies on Wernicke’s Area, which processes the meaning of spoken words.
Unit 2, Part II: States of Consciousness
Biological Effects of Alcohol – The physiological impacts of alcohol consumption on the body and brain. Slower reaction time while driving, impaired judgment, and reduced inhibitions are common biological effects of alcohol due to its depressant action on the central nervous system.
NREM-1 Sleep – The initial, lightest stage of non-REM sleep, characterized by slow breathing, irregular brain waves (theta waves), and often hypnagogic hallucinations. Feeling like you are falling (hypnic jerk) as you drift off to sleep indicates NREM-1 sleep.
NREM-2 Sleep – A deeper stage of non-REM sleep where muscle activity decreases, and conscious awareness of the external environment fades. This stage is characterized by sleep spindles and K-complexes on an EEG, and accounts for about half of all sleep.
NREM-3 Sleep – The deepest stage of non-REM sleep, also known as slow-wave sleep. It is characterized by delta waves, making it hard to wake up. This stage is crucial for physical restoration and growth hormone release.
REM Sleep – Rapid eye movement sleep, a stage of sleep characterized by vivid dreams, muscle paralysis (atonia), and brain activity similar to wakefulness (paradoxical sleep). Vivid dreams with rapid eye movement are hallmarks of REM sleep.
Activation-Synthesis Theory – A neurobiological theory of dreaming that suggests dreams result from the brain's attempt to make sense of random neural activation originating in the brainstem during REM sleep. A random dream made of strange, illogical images and sensations that the prefrontal cortex tries to weave into a story is consistent with this theory.
Information Processing Theory – A theory suggesting that dreams help us sort out the day's events and consolidate memories. Dreaming about material studied earlier in the day supports the information processing theory, as the brain processes and integrates new information during sleep.
Freudian Theory – Sigmund Freud's theory that dreams are a disguised fulfillment of repressed wishes, often containing symbolic meanings (latent content) beneath the surface story (manifest content). Dreams reflecting hidden (unconscious) desires, such as flying symbolizing freedom, align with Freudian theory.
Unit 3: Sensation & Perception
Afterimages – Visual sensations that persist after the initial stimulus has been removed. Seeing green after staring at a red image is an example of an afterimage, explained by the opponent-process theory of color vision, where fatigued red receptors cause an overactivation of green receptors.
Cocktail Party Effect – The ability to focus one's auditory attention on a particular stimulus (like a single conversation) while filtering out a range of other stimuli. Hearing your name in a noisy room demonstrates this effect, as your unconscious mind is constantly monitoring for personally relevant information.
Depth Perception – The ability to perceive the world in three dimensions and judge the distance of objects. Catching a ball thrown toward you requires depth perception, utilizing both monocular (e.g., relative size, interposition) and binocular cues (e.g., retinal disparity, convergence).
Frequency and Pitch – Frequency refers to the number of sound waves that pass a point in a given time, while pitch is our perception of that frequency. A whistle sounds higher than a drum because the whistle produces sound waves of higher frequency, which we perceive as a higher pitch.
Gestalt Principles – Principles of perception that describe how the human mind tends to organize sensory information into meaningful wholes. Seeing a whole shape (like a triangle or square) from broken pieces or scattered lines illustrates Gestalt principles like closure, proximity, and similarity, where the brain actively constructs a unified perception.
Olfaction – The sense of smell, processed by chemoreceptors in the nasal cavity sensitive to airborne molecules. Smelling smoke before seeing a fire is an example of olfaction, which can trigger strong memories and emotions due to its direct connection to the limbic system.
Path of Visual Processing – The route that visual information travels from the eyes to the brain. Seeing a car and slamming the brakes involves light entering the eye, stimulating photoreceptors in the retina, electrical signals traveling via the optic nerve to the thalamus, and then to the primary visual cortex in the occipital lobe for interpretation, leading to a motor response.
Selective Attention – The process by which one input or task is attended to while others are tuned out. Missing a text while deeply immersed in studying demonstrates selective attention, as your focus is narrowed to the academic material, filtering out other stimuli.
Sensory Adaptation – A decrease in sensitivity to a constant level of stimulation over time. Not noticing a ticking clock anymore after being in a room for a while is sensory adaptation; your sensory receptors become less responsive to the unchanging stimulus.
Sensory Interaction – The principle that one sense may influence another. Food tastes bland when you have a cold because your sense of smell (olfaction) is impaired, significantly affecting your perception of taste (gustation).
Unit 5, Part I: Cognition
Algorithm – A methodical, logical rule or procedure that guarantees solving a particular problem. Following a step-by-step formula to solve a math equation is an algorithm; it's exhaustive and ensures a correct solution if followed correctly.
Availability Heuristic – A mental shortcut where we estimate the likelihood of events based on their availability in memory; if instances come readily to mind, we presume such events are common. Thinking plane crashes are common after seeing one dramatically portrayed on the news is an availability heuristic because vivid, easily recalled examples bias our perception of frequency.
Ebbinghaus’ Forgetting Curve – A graph plotting the amount of retention (or forgetting) against time for a certain material. Forgetting notes quickly without reviewing them, and then the rate of forgetting slowing over time, illustrates Ebbinghaus’ finding that forgetting is initially rapid and then levels off.
Encoding Failure – The inability to form a memory because the information was never properly transferred from sensory memory into long-term memory. Forgetting someone’s name immediately after being introduced often results from encoding failure; you heard it, but didn't pay enough attention to encode it into memory.
Episodic Memory – A type of explicit (declarative) memory that involves conscious recollection of personal experiences and specific events from one's life. Remembering your last birthday party, including details like who was there and what you did, is an example of episodic memory.
Functional Fixedness – A cognitive bias that limits a person to using an object only in the way it is traditionally used. Not seeing a paperclip as a potential tool to reset a phone or unlock a door demonstrates functional fixedness; one is 'fixed' on its primary function.
Iconic Memory – A very brief (a few tenths of a second) sensory memory of visual stimuli; a photographic or picture-like memory. Briefly remembering a flashed image long enough to recall a few details from it is iconic memory.
Echoic Memory – A very brief (3-4 seconds) sensory memory of auditory stimuli; if attention is elsewhere, sounds and words can still be recalled within this time. Replaying what someone just said in your head right after they said it (e.g., if you weren't fully listening) is echoic memory.
Implicit Memory – Retention independent of conscious recollection (non-declarative memory). Typing on a keyboard without consciously thinking about the location of each letter, or riding a bike, are examples of implicit (procedural) memory.
Language and Culture – The intertwined relationship where language influences thought and perception (linguistic relativity hypothesis) and reflects cultural values. Some languages having no words for certain colors (e.g., distinguishing between blue and green) can influence how speakers of those languages perceive and categorize the world, an idea related to the Whorf-Sapir hypothesis.
Levels of Processing – A theory stating that the depth of processing (shallow or deep) impacts memory retention. Remembering a word better when you think about its meaning (deep processing) rather than just its appearance or sound (shallow processing) supports this concept.
Memory Storage – The process of maintaining information in memory over time. Moving a phone number from short-term memory (where it's held briefly) to long-term memory (for permanent retention) involves memory storage and consolidation processes in the brain.
Proactive Interference – The disruptive effect of prior learning on the recall of new information. When old passwords interfere with your ability to remember new ones, this is proactive interference: old information is blocking the retrieval of new.
Retroactive Interference – The disruptive effect of new learning on the recall of old information. New learning causing you to forget old material, such as learning a new phone number making it hard to recall your old one, is retroactive interference.
Recall – A measure of memory in which the person must retrieve information learned earlier, as on a fill-in-the-blank test. Writing an essay from memory, with minimal cues, is a pure test of recall.
Serial Position Effect – The tendency to remember best the first and last items in a list more accurately than the middle items. Remembering the first (primacy effect) and last (recency effect) items on a list better than those in the middle demonstrates the serial position effect.
Unit 5, Part II: Testing & Individual Differences
Aptitude Tests – Tests designed to predict a person's future performance or capacity to learn. The SAT predicting college success is an aptitude test, attempting to gauge one's potential for academic achievement.
Criterion-Related Validity – The extent to which a measure is related to an outcome criterion. A driving test predicting future safe driving behavior (e.g., fewer accidents) demonstrates strong criterion-related validity, as the test scores correlate with a relevant outcome.
Crystallized Intelligence – Accumulated knowledge and verbal skills that tend to increase with age. Knowing a large vocabulary of words, understanding complex concepts from experience, or having good general knowledge are examples of crystallized intelligence.
Fluid Intelligence – Our ability to reason speedily and abstractly, to solve novel problems, and to process information quickly; tends to decrease with age. Solving a new and complex puzzle quickly or identifying patterns in abstract stimuli demonstrates fluid intelligence.
Flynn Effect – The observed tendency for IQ scores to increase across generations worldwide. The average IQ scores increasing by about 3 points per decade over generations is the Flynn Effect, often attributed to better nutrition, education, and complex environments.
Standardized Tests – Tests developed with uniform procedures for administration and scoring, often with established norms. Everyone taking the same AP exam under identical conditions ensures standardization, allowing for comparison of scores across individuals and groups.
Reliability – The extent to which a test yields consistent results, as assessed by the consistency of scores on two halves of the test, on alternate forms of the test, or on retesting. A test giving consistent scores each time it is administered, or consistent scores across different parts of the test, indicates high reliability.
Validity – The extent to which a test measures or predicts what it is supposed to. A test accurately measuring intelligence, and not something else like reading comprehension or general knowledge, demonstrates high validity.
Unit 6: Developmental Psychology
Cross-Sectional Studies – A type of observational study that analyzes data from a population, or a representative subset, at a specific point in time. Comparing memory abilities in teens, young adults, and older adults at the same time is a cross-sectional study, allowing for quick comparisons between age groups but not tracking individual change.
Longitudinal Studies – A research design that involves repeated observations of the same variables (e.g., people) over long periods of time. Following children from birth to adulthood to observe their cognitive or social development is a longitudinal study, providing insights into individual growth and change over time.
Effects of Aging – The typical physical, cognitive, and socio-emotional changes that occur as individuals grow older. While individuals may experience slower reaction times or some fluid intelligence decline, they often maintain strong knowledge (crystallized intelligence) and wisdom, and emotional regulation can even improve with age.
Brain Development – The continuous process of growth and refinement of the brain's structure and function from conception through late adolescence. Extra neural connections being pruned (synaptic pruning) in adolescence, along with myelination, leads to more efficient and specialized brain networks.
Puberty – The period of sexual maturation, during which a person becomes capable of reproduction. Growth spurts, the development of secondary sexual characteristics (e.g., voice changes in boys, breast development in girls), and hormonal shifts are key aspects of puberty.
Sensorimotor Stage – Piaget's first stage (birth to about 2 years), during which infants learn about the world mostly through their senses and motor activities. A baby searching for a hidden toy demonstrates object permanence, a key achievement of the sensorimotor stage where they understand objects continue to exist even when not seen.
Preoperational Stage – Piaget's second stage (about 2 to 7 years), characterized by symbolic thought but lacking logical reasoning. A child thinking everyone sees what they see (egocentrism) and struggling with conservation tasks (e.g., understanding that the amount of liquid doesn't change when poured into a different-shaped glass) are hallmarks of this stage.
Concrete Operational Stage – Piaget's third stage (about 7 to 11 years), during which children gain the mental operations that enable them to think logically about concrete events. Understanding conservation of volume (e.g., that changing a liquid's container doesn't change its amount) and performing basic mathematical transformations are key achievements.
Formal Operational Stage – Piaget's fourth and final stage (beginning around age 12), when people begin to think logically about abstract concepts and form hypotheses. Thinking about abstract moral issues, engaging in hypothetical reasoning, and considering future possibilities are characteristic of the formal operational stage.
Erikson: Identity vs Role Confusion – The fifth stage of Erik Erikson's psychosocial development, occurring during adolescence (roughly 12-18 years). A teen exploring various career options, social roles, and personal values to form a coherent sense of self is grappling with the conflict of identity versus role confusion.
Secure Attachment – A healthy attachment style where an infant explores freely in the presence of the caregiver, is distressed when the caregiver leaves, and seeks comfort upon the caregiver's return. A child seeking comfort and being easily soothed when their parent returns after a brief separation indicates a secure attachment, developed in response to a consistently responsive caregiver.
Avoidant Attachment – An insecure attachment style where an infant shows little distress when the caregiver leaves and avoids the caregiver upon return. A child who largely ignores or avoids their parent after a separation suggests an avoidant attachment, often associated with caregivers who are consistently unresponsive or rejecting.
Ambivalent Attachment (also known as Anxious-Ambivalent or Resistant) – An insecure attachment style where an infant becomes extremely distressed when the caregiver leaves, but then acts ambivalently, both seeking and resisting contact, upon the caregiver's return. A child who is clingy before separation, highly distressed when the parent leaves, and then is hard to soothe and shows anger or resistance when the parent returns demonstrates ambivalent attachment, often due to inconsistent caregiver responsiveness.
Disorganized Attachment – An insecure attachment style characterized by a lack of consistent attachment behavior, often appearing confused, dazed, or contradictory. A child showing confused, fearful, or contradictory behavior (e.g., approaching the parent while also looking away) upon reunion suggests a disorganized attachment, often linked to caregivers who are sources of both comfort and fear.