AP Psychology Study Guide: Units, Studies, and the FRQ Format That Earns 5s

AP Psychology covers more content than most AP courses — nine units spanning biological, cognitive, developmental, social, and clinical psychology. The College Board exam rewards students who have both broad content knowledge and the specific ability to apply psychological concepts to novel scenarios and research situations.

This guide covers the unit-by-unit knowledge base and the FRQ application technique that distinguishes AP 5s.

The FRQ format: application, not definition

The most important skill for AP Psychology FRQs is the ability to apply psychological concepts to specific scenarios — not to define them in the abstract. This distinction is where most students lose points.

The definition trap:

Question: 'Yolanda's teacher gives the class a pop quiz whenever the students have been noisy. After a few weeks, the students become quiet as soon as they see the teacher walk toward the desk where she keeps the quizzes. Explain how the concept of a conditioned stimulus is illustrated in this scenario.'

Definition-only answer (0 points): 'A conditioned stimulus is a stimulus that, through repeated pairing with an unconditioned stimulus, comes to elicit a conditioned response.'

Applied answer (1 point): 'In this scenario, the teacher's movement toward the desk is the conditioned stimulus. Initially it was neutral, but after being repeatedly paired with the quiz (unconditioned stimulus), it now elicits the conditioned response (students becoming quiet) on its own.'

The applied answer is worth points because it identifies the specific elements of the scenario that instantiate the concept. The definition alone is not enough.

The AP Psychology FRQ formula:

For each concept asked about: [term] + [because/in which] + [specific scenario detail that illustrates the term].

Example: 'This is an example of negative reinforcement, in which the students' behaviour (becoming quiet) is strengthened because it removes an aversive stimulus (the pop quiz).'

Unit-by-unit high-yield content

Unit 2 — Biological Bases:

Neurotransmitters and their roles: dopamine (reward, movement — depletion linked to Parkinson's; excess linked to schizophrenia); serotonin (mood, sleep — SSRIs increase synaptic serotonin; depletion linked to depression); acetylcholine (muscle contraction, memory — depletion linked to Alzheimer's); norepinephrine (arousal, alertness); GABA (inhibitory — reduces neural activity; drugs like benzodiazepines enhance GABA activity); glutamate (excitatory — important for learning and memory).

Brain regions and functions: prefrontal cortex (executive function, planning, impulse control); amygdala (fear response, emotion processing); hippocampus (formation of new long-term memories — HM's bilateral hippocampal removal caused anterograde amnesia); cerebellum (coordination, balance, procedural learning); Broca's area (left hemisphere, speech production); Wernicke's area (left hemisphere, speech comprehension); corpus callosum (connects left and right hemispheres — split-brain patients demonstrate separate processing in each hemisphere).

Unit 4 — Learning:

Classical conditioning: unconditioned stimulus (UCS, naturally elicits response) → unconditioned response (UCR). Conditioned stimulus (CS, paired with UCS) → conditioned response (CR, same as UCR but elicited by CS alone). Key processes: acquisition (pairing of CS and UCS builds association); extinction (CS presented without UCS — CR weakens); spontaneous recovery (extinguished CR reappears after a rest period); generalisation (stimuli similar to CS elicit CR); discrimination (learned to respond only to specific CS, not similar stimuli).

Operant conditioning: reinforcement (increases behavior frequency); punishment (decreases behavior frequency). Positive = adds stimulus; negative = removes stimulus. Schedules of reinforcement: fixed ratio (after N responses — produces high rates with post-reinforcement pause), variable ratio (after variable number of responses — highest rate, most resistant to extinction; gambling), fixed interval (after fixed time — scalloping pattern), variable interval (after variable time — steady moderate rate; checking email).

Unit 9 — Social Psychology:

Attribution theory: dispositional attribution (explaining behavior by internal factors — personality, ability); situational attribution (explaining behavior by external factors — luck, context). Fundamental attribution error: tendency to overestimate dispositional and underestimate situational causes for others' behavior. Actor-observer bias: explain own behavior situationally, others' dispositionally.

Conformity (Asch) vs obedience (Milgram): conformity is changing behaviour to match group norms without direct instruction; obedience involves complying with direct commands from authority. Both demonstrate social influence, but the mechanism differs. Cognitive dissonance (Festinger): discomfort from holding contradictory beliefs or acting contrary to beliefs, motivating attitude or belief change.

Use the Flashcard Tool for unit-by-unit vocabulary review. Create one card per term: front = term; back = definition AND a concrete example. Review with the Leitner system — move mastered cards to weekly review; keep difficult cards on daily review.

Research methods: the most versatile knowledge

Unit 1 (research methods) is tested in almost every FRQ — experimental design, variable identification, and interpretation of results appear across all units. This makes Unit 1 the highest-leverage revision for FRQ performance.

Key research methods concepts for FRQ:

Independent variable (IV): what the experimenter manipulates. Dependent variable (DV): what is measured. Control group: receives no treatment (or a placebo); comparison baseline. Experimental group: receives the experimental treatment. Random assignment: participants randomly assigned to conditions — controls for pre-existing differences (confounding variables). Random sampling: selecting participants randomly from a population — increases generalisability. Double-blind: neither participant nor researcher knows who received the treatment — controls for both placebo effect and experimenter bias. Operational definition: precise definition of how a variable is measured ('stress measured by self-report on a validated 10-item scale,' not just 'stress').

For any FRQ experimental design question: Identify the IV and DV precisely, include a control group, specify random assignment, state the operational definition of your DV, and identify at least one potential confounding variable and how to control for it.

Use the Cornell Notes Tool for Unit 1: research methods concepts in the main column, FRQ application patterns in the cue column. Reviewing this page weekly makes the FRQ research methods questions nearly automatic.

Preparation schedule

8 weeks before exam: Create a unit-by-unit flashcard deck (all 9 units). Review 25 cards per day, starting with the units most heavily tested (Units 2, 4, 9). Set aside 30 minutes for FRQ practice once per week.

4 weeks before: Full practice exam under timed conditions once per week. After each practice FRQ, check your answer against the College Board rubric and identify whether your answers are definitions or applications. Drill the concepts where you gave definitions.

2 weeks before: Daily flashcard review (all decks). One FRQ practice per day — especially scenario-based FRQs. Review College Board sample scored responses to calibrate what earns points.

Use the Pomodoro Timer for focused vocabulary review sessions: 25 minutes for one unit's flashcard deck, 5-minute break, 25 minutes for a different unit. Interleaving units mirrors the shuffled format of the MCQ section and builds retrieval across the full content. The Spaced Repetition course explains the research behind why this distributed practice is more effective than unit-by-unit blocking.

See GCSE Psychology revision guide for the UK equivalent qualification, and A Level Psychology study guide for the more advanced treatment of the same topics.