Psychology
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AP Psychology — Cheatsheet

Formulas, exam-day tips, and key terms on one page.

On the exam

How to get a 5

Key terms

Function of the myelin sheath — Insulates the axon and speeds neural transmission; degeneration (e.g., MS) slows signals.
Negative reinforcement vs punishment — Negative reinforcement removes an aversive stimulus to INCREASE behavior; punishment DECREASES behavior.
Independent vs dependent variable — IV is manipulated by the researcher; DV is measured as the outcome.
Rods vs cones — Rods: peripheral/night, black-and-white, very light-sensitive. Cones: central (fovea) color vision, need bright light.
Three memory processes — Encoding (in), storage (hold over time), retrieval (out).
James-Lange vs Cannon-Bard — James-Lange: arousal → emotion. Cannon-Bard: arousal and emotion occur simultaneously and independently.
Which structure forms new explicit memories? — The hippocampus.
Correlation coefficient — From −1 to +1; sign = direction, magnitude = strength. Correlation does not prove causation.
Deindividuation — Loss of self-awareness and restraint in a group, especially when anonymous — a mechanism behind crowd behavior.
Operant vs classical conditioning — Operant: behavior shaped by consequences. Classical: associating two stimuli to produce a reflexive response.
Neurotransmitter action — Released into the synaptic gap, binds receptors on the receiving neuron, then reabsorbed (reuptake).
Standard deviation — The average amount scores vary from the mean; larger SD = more spread.
Classical conditioning — the four terms, with an example — Unconditioned stimulus naturally triggers a response (food). Unconditioned response is that automatic reaction (salivation). Neutral stimulus becomes the conditioned stimulus after pairing (bell). Conditioned response is the learned reaction (salivating to the bell). Pavlov demonstrated this; Watson extended it to fear in the Little Albert study.
Reinforcement and punishment — the 2×2 — Positive means adding a stimulus, negative means removing one; reinforcement increases behavior, punishment decreases it. Positive reinforcement: praise for studying. Negative reinforcement: canceling homework so classwork rises. Positive punishment: adding a detention. Negative punishment (omission): taking away a phone. Direction of behavior change tells you reinforcement from punishment.
Reinforcement schedules and their response patterns — Variable ratio (unpredictable number of responses) produces the highest and most extinction-resistant rate — slot machines. Fixed ratio produces a post-reinforcement pause. Fixed interval produces a scalloped pattern of accelerating responses. Variable interval produces slow, steady responding. Ratio schedules generally beat interval schedules for rate.
Bandura — observational learning — People acquire behavior by watching models and observing their consequences (vicarious reinforcement), without direct reinforcement of their own. The Bobo doll studies showed children imitating modeled aggression. Bandura also developed the concepts of self-efficacy and reciprocal determinism, in which person, behavior, and environment mutually influence one another.
Piaget’s four stages — Sensorimotor (birth to about 2): object permanence develops. Preoperational (2–7): symbolic thought but egocentrism and failure of conservation. Concrete operational (7–11): conservation and reversibility with concrete material. Formal operational (12 and up): abstract and hypothetical reasoning. Assimilation fits new information into existing schemas; accommodation revises the schema.
Vygotsky vs. Piaget — Vygotsky emphasized the social and cultural context of learning: the zone of proximal development is what a learner can do with guidance but not alone, and scaffolding is the temporary support that is faded. Piaget emphasized the child constructing understanding through individual interaction with the environment in fixed stages.
Erikson’s psychosocial stages — the exam favorites — Trust vs. mistrust (infancy), autonomy vs. shame (toddler), initiative vs. guilt (preschool), industry vs. inferiority (school age), identity vs. role confusion (adolescence — the most frequently tested), intimacy vs. isolation (young adult), generativity vs. stagnation (middle adult), integrity vs. despair (late adult).
Attachment — Harlow and Ainsworth — Harlow’s monkeys chose a cloth surrogate over a wire one that provided food, showing contact comfort matters independently of feeding. Ainsworth’s Strange Situation identified secure (explores, protests separation, quickly soothed), insecure-avoidant (indifferent), insecure-resistant or ambivalent (distressed and inconsolable), and later disorganized attachment.
Conformity vs. obedience — Asch and Milgram — Asch: participants agreed with an obviously wrong unanimous group on a line-judgment task, demonstrating normative social influence (conforming for acceptance) as distinct from informational influence (conforming because you believe others know better). Milgram: about 65 percent of participants obeyed an authority figure to the maximum 450-volt shock level.
Attribution errors and biases — Fundamental attribution error: overweighting disposition and underweighting situation when explaining others. Actor-observer bias: applying situational explanations to yourself. Self-serving bias: crediting successes to ability and failures to circumstance. Just-world hypothesis: believing people get what they deserve.
Cognitive dissonance — Festinger — Holding inconsistent cognitions, or acting contrary to an attitude, creates discomfort that motivates change in the easier element — usually the attitude rather than the behavior. This is why insufficient justification (being paid only one dollar to lie) produces more attitude change than generous payment: with no external reason, the person must change the belief.
Memory — encoding, storage, retrieval failures — Encoding failures: shallow processing, divided attention. Storage decay: Ebbinghaus’s forgetting curve, steepest immediately after learning. Retrieval failures: tip-of-the-tongue, and interference — proactive (old material disrupts new) versus retroactive (new material disrupts old). Context-dependent and state-dependent memory show that retrieval cues matter.