Exhaustive AP Psychology Definitive Study Guide
Foundations of Biological Psychology
The fundamental question of psychology: Are we shaped more by biology (nature) or by experience (nurture)?
Current Consensus: It is always a combination of both. Genes provide genetic predispositions (a higher likelihood of traits), while the environment determines their expression.
Research Designs for Nature vs. Nurture: - Twin Studies: Comparing identical twins (share of genes) with fraternal twins (share about of genes). - Adoption Studies: Comparing adoptees to biological parents (nature) and adoptive parents (nurture). - Family Studies: Examining trait patterns across various relatives.
Evolutionary Perspective: Argues that behaviors aiding survival were passed down through natural selection.
Misapplication Warning: The evolutionary perspective has been historically misapplied through eugenics, the practice of forcibly sterilizing individuals deemed to have undesirable traits.
The Nervous System and Endocrine Coordination
Central Nervous System (CNS): Includes the brain and spinal cord. It coordinates all bodily functions. The spinal cord can manage simple reflex arcs independently of the brain.
Peripheral Nervous System (PNS): Links the CNS to the rest of the body. Contains sensory neurons (information in) and motor neurons (information out).
Somatic System: Controls deliberate, voluntary movements like walking or raising a hand.
Autonomic System: Manages automatic functions such as heartbeat, digestion, and pupil dilation.
Sympathetic Nervous System: Acts as the "gas pedal" for emergencies (stress response).
Parasympathetic Nervous System: Acts as the "break" to return the body to its normal state.
Endocrine System: Transmits hormones through the bloodstream. It is directed by the pituitary gland (the master gland), which is controlled by the hypothalamus.
Neural Communication and the Action Potential
Anatomy of a Neuron: - Dendrites: Gather incoming signals. - Cell Body: Integrates input to determine if a signal should be forwarded. - Axon: The path the message travels across. - Myelin Sheath: A fatty layer made by gial cells that insulates the axon. Damage leads to conditions like multiple sclerosis or myina gravis. - Nodes of Ranva: Gaps in the myelin that facilitate saltatory conduction, dramatically accelerating transmission. - Axon Terminal: Passes the message to the next neuron.
Types of Neurons: - Sensory: Carry information toward the brain. - Motor: Carry instructions outward to muscles. - Interneurons: Handle computation and communication between sensory and motor neurons.
Neural Firing Process: - Resting Potential: The idle, negatively charged state of a neuron. - Threshold: The critical level of stimulation required to fire. - Action Potential: The firing of the neuron. It follows the all-or-none principle (it either fires fully or not at all). - Depolarization: The charge flips to positive. - Repolarization: Returns the charge to negative. - Refractory Period: A brief time when the neuron cannot fire again.
The Synapse: A tiny gap between neurons. Neurotransmitters (NTs) are released from vesicles into the synaptic clft and bind to receptor sites. After the message is delivered, reuptake vacuums leftover NTs back into the sending neuron.
Major Neurotransmitters and Hormones
Key Neurotransmitters: - AC (Acetylcholine): Involved in every voluntary muscle twitch and memory formation. Lack is linked to Alzheimer's disease. - Dopamine: Power pleasure circuits and movement. Excess is linked to schizophrenia; deficiency is linked to Parkinson's tremors. - Serotonin: Regulates mood, sleep, and appetite. Shortage is a major factor in depression. - GABA: Main inhibitory chemical that quiets neural activity. Low levels cause anxiety and seizures. - Glutamate: Main excitatory chemical for learning. - Endorphins: Natural pain relief; hijacked by opioid drugs. - Norepinephrine: Keeps the body alert to stress. - Substance P: Carries pain messages to the brain.
Key Hormones: - Adrenaline: Fight or flight response. - Leptin: Released by fat cells to signal fullness. - Ghrelin: Released by the stomach to signal hunger. - Melatonin: Released by the pineal gland to promote sleep. - Oxytocin: Promotes social bonding.
Brain Structures and Functions
Brain Stem/Older Brain: - Medulla: Controls heartbeat and breathing; damage is almost always fatal. - Ponds: Bridges brain regions and regulates sleep. - RA (Reticular Activating System): Governs arousal and filters sensory information. - Cerebellum: Smoothes coordination, balance, and muscle memory; it refines movement rather than starting it.
Limbic System and Sensory Routing: - Thalamus: Routes sensory information to the cortex for all senses except one (smell). Smell goes directly to the alactory bulb. - Hypothalamus: Manages homeostasis (hunger, thirst, temperature) and directs the pituitary gland. - Amygdala: Handles fear and threat detection. - Hippocampus: Packages short-term memories into long-term ones. Damage causes anterograde amnesia.
Cerebral Cortex (Wrinkled Outer Layer): - Frontal Lobe: Houses the prefrontal cortex (decision making), motor cortex (movement), and Broca's area (speech production; damage causes halting speech). - Parietal Lobe: Contains the somataensory cortex (body sensation mapped by sensitivity). - Temporal Lobe: Handles hearing and verix area (language comprehension; damage causes nonsensical speech). - Occipital Lobe: Primary visual processing site.
Corpus Colosum: Connects the two hemispheres. Split brain research shows each hemisphere has specialized functions.
Neuroplasticity: The brain's ability to reroute around damage, which is highest in childhood.
Research Tools: fMRI (tracking blood flow/activity), EEG (electrical patterns), CT and MRI (anatomy), and lesioning (destroying tissue to observe effects).
Sensation and Perception
Definitions: - Sensation: Detecting stimuli via transduction (converting energy to neural signals). - Perception: The brain's interpretation of signals.
Thresholds: - Absolute Threshold: Minimum stimulus detected of the time (e.g., candle flame from miles away). - Weber's Law: Just Noticeable Difference (JND) is a constant proportion, not a constant amount ( lb vs lbs is noticeable, but vs is not). - Signal Detection Theory: Sensitivity changes based on motivation, expectations, and consequences.
Vision: - Rods: Peripheral, per eye, handle dim light and motion, no color. - Cones: Central (phobia), per eye, process color (Red, Green, Blue). - Trichromatic Theory: Color processing at the receptor (cone) level. - Opponent Process Theory: Processing at the ganglion cell level; explains after images and opposing pairs.
Audition: - Sound waves enter ear, amplified by osticles, and transduced by hair cells in the basler membrane of the coia. - Pitch Theories: Place theory (high pitch), frequency theory (low pitch), and valley theory (mid-range).
Other Senses: - Olfaction: Smell skips the thalamus and goes to the alactory bulb/limbic system. - Gustation: Sweet, sour, salty, bitter, umami, and oologus. - Pain: Gate Control Theory suggests the spinal cord has a neural gate that can be closed by competing input. - Vestibular Sense: Balance via semi-circular canals. - Kinesthesia: Tracking body position via muscle and joint receptors.
Principles of Organization: - Top-Down Processing: Guided by context/knowledge; Bottom-Up: Guided by raw data. - Selective Attention: Cocktail party effect (hearing your name in a crowd). - Failures of Perception: Inattentional blindness (missing a gorilla) and change blindness. - Gestalt Principles: Figure ground, proximity, similarity, and closure.
Cognitive Psychology: Memory, Thinking, and Intelligence
Multi-Store Model of Memory: - Sensory Memory: Iconic (visual, <0.5s) and echoic (sound, brief). - Short-Term Memory (STM): Holds roughly items for up to seconds. - Working Memory: Active processing via the central executive, funological loop, and visual spatial sketch pad. - Long-Term Memory (LTM): Explicit (episodic facts, semantic facts) and Implicit (procedural skills like riding a bike).
Biological Mechanisms: LTP (Long Term Potentiation) is when neurons that fire together wire together.
Forgetting and Distortion: - Eping House Forgetting Curve: Forgetting is steepest immediately after learning. - Interference: Proactive (old blocks new) and Retroactive (new blocks old). - Misinformation Effect: Loftus showed that leading words (e.g., "smash" vs "hit") can alter memories.
Problem Solving and Biases: - Algorithms: Slow, guaranteed solutions. Heuristics: Fast mental shortcuts. - Representativeness Heuristic: Judging based on stereotypes/prototypes. - Availability Heuristic: Overweighting vivid, easily recalled events. - Functional Fixedness: Inability to see new uses for familiar objects.
Intelligence: - Spearman's G: Single general intelligence factor. - Multiple Intelligences: Gardner (8 types) and Serber (Analytic, Creative, Practical). - IQ Calculation: . - Flynn Effect: IQ scores rise about points per decade due to environmental factors.
Developmental Psychology and Learning
Development Concepts: - Teratogens: Substances like alcohol causing FAS (Fetal Alcohol Syndrome). - Piaget's Stages: Sensory motor, pre-operational, concrete operational, and formal operational. - Beigotsski's ZPD: Zone of Proximal Development (learning with help) and scaffolding. - Parenting Styles: Authoritative (best outcomes), Authoritarian, and Permissive. - Erikson's Psychosocial Stages: 8 stages from Trust vs. Mistrust to Integrity vs. Despair.
Learning Perspectives: - Classical Conditioning: Pairing a Neutral Stimulus with an Unconditioned Stimulus (UCS) to create a Conditioned Stimulus (CS) and Conditioned Response (CR). - Little Albert: Proved emotional reactions can be conditioned (Watson). - Garcia's Taste Aversion: Biological preparedness to associate taste with nausea with long delays. - Operant Conditioning: Law of Effect (Thorndike). Behavior shaped by rewards/punishments. - Reinforcement Schedules: Fixed Ratio (set number), Variable Ratio (unpredictable number; highest response rate/slot machines), Fixed Interval (set time), Variable Interval (unpredictable time; pop quizzes). - Social Learning Theory: Bandura's Boba doll experiment showed children copy observed aggression.
Social Psychology and Personality
Social Cognition: - Fundamental Attribution Error (FAE): Overestimating personality and underestimating situation in others' behavior. - Cognitive Dissonance: Tension from behavior-attitude contradictions; solved by changing one or the other. - Mere Exposure Effect: Repeated exposure increases liking.
Interaction and Influence: - Conformity: Ash's line study. - Obedience: Mgram's study showing of participants deliver maximum shock. - Bystander Effect: Diffusion of responsibility leading to less help when more people are present. - Group Dynamics: De-individuation (loss of self in groups), Group Think, and Social Loafing.
Personality: - Freud's Psyche: Id (pleasure), Superego (morality), Ego (reality mediator). - Defense Mechanisms: Repression, denial, projection, displacement, reaction formation, rationalization, sublimation, and regression. - Big Five Traits (CANOE): Conscientiousness, Agreeableness, Neuroticism, Openness, Extraversion.
Mental and Physical Health
Stress and Health: - General Adaptation Syndrome (GS): Selye's stages: Alarm, Resistance, Exhaustion. - Coping: Problem-focused (addressing stressor) vs. Emotion-focused (managing reaction).
Psychological Disorders: - DSM-5/ICD: Diagnostic manuals used for specialized training and treatment. - Schizophrenia: Positive symptoms (hallucinations, delusions, word salad) and negative symptoms (flat affect). - Anxiety Disorders: GAD, specific phobias, social anxiety, agorophobia, and panic disorder.
Treatments: - Psychotherapy: CBT (Cognitive Behavioral Therapy) is most supported. ROGERS' PCT (Person-Centered Therapy) involves unconditional positive regard. - Biomedical: SSRIs block serotonin reuptake. Lithium for bipolar. Antipsychotics for schizophrenia.
Research Methods and Statistics
Experimental Design: Manipulate Independent Variable (IV), measure Dependent Variable (DV), and use Random Assignment to establish cause/effect.
Golden Rule: Correlation does not equal causation.
Statistics: - Measures of Central Tendency: Mean, Median (best for skewed data), Mode. - Normal Curve: within standard deviation, within , within . - Skew: Positive (tail right), Negative (tail left). - Ethics: IRB reviews, informed consent, confidentiality, and debriefing.