AP Psychology covers the scientific study of behavior and mental processes across many connected units. Students need this cheat sheet to organize major perspectives, research methods, brain and body systems, learning principles, cognition, development, disorders, treatment, and social behavior. It works as a quick reference for reviewing key ideas before quizzes, unit tests, and the AP exam.
The most important ideas include how psychologists ask scientific questions, how biological systems influence behavior, and how experience shapes learning and memory. Students should connect famous theorists to their major contributions and recognize when concepts apply to real examples. Strong AP Psychology review also requires knowing research terms, ethical rules, and the difference between correlation and causation.
Key Facts
- The scientific method follows the pattern: form a hypothesis, define variables operationally, collect data, analyze results, and draw a conclusion.
- In an experiment, the independent variable is manipulated, the dependent variable is measured, and random assignment helps control confounding variables.
- Correlation is described by r, ranges from -1.00 to +1.00, and never proves that one variable causes another.
- A neuron communicates when dendrites receive signals, the soma processes them, the axon carries an action potential, and neurotransmitters cross the synapse.
- Classical conditioning pairs a neutral stimulus with an unconditioned stimulus until the neutral stimulus becomes a conditioned stimulus that triggers a conditioned response.
- Operant conditioning changes behavior through consequences, where reinforcement increases behavior and punishment decreases behavior.
- Memory is often described as encoding, storage, and retrieval, with information moving through sensory memory, short-term or working memory, and long-term memory.
- Social psychology shows that behavior is shaped by the situation, including conformity, obedience, group influence, attribution, prejudice, and helping behavior.
Vocabulary
- Operational definition
- A precise explanation of how a variable is measured or manipulated in a study.
- Random assignment
- A procedure that places participants into experimental groups by chance to reduce preexisting differences between groups.
- Neurotransmitter
- A chemical messenger that travels across a synapse to influence the next neuron, muscle, or gland.
- Reinforcement
- Any consequence that increases the likelihood that a behavior will happen again.
- Schema
- A mental framework that helps a person organize and interpret information.
- Attribution
- An explanation people make about the cause of their own behavior or another person's behavior.
Common Mistakes to Avoid
- Confusing correlation with causation is wrong because a relationship between two variables does not prove that one variable directly caused the other.
- Mixing up negative reinforcement and punishment is wrong because negative reinforcement increases behavior by removing something unpleasant, while punishment decreases behavior.
- Forgetting operational definitions is wrong because vague variables cannot be measured consistently or tested scientifically.
- Assuming every psychological disorder has one cause is wrong because most disorders involve biological, psychological, and social factors working together.
- Relying only on memorized theorist names is wrong because AP Psychology questions often ask students to apply a concept to a new scenario.
Practice Questions
- 1 A researcher randomly assigns 80 students to study with either music or silence, then compares their test scores. Identify the independent variable, dependent variable, and one reason random assignment matters.
- 2 A study reports a correlation of r = -0.72 between hours of sleep debt and quiz performance. Explain the direction and strength of the relationship, and state whether causation is proven.
- 3 A dog hears a bell before food is presented. After repeated pairings, the dog salivates when the bell rings alone. Identify the neutral stimulus, unconditioned stimulus, conditioned stimulus, and conditioned response.
- 4 Why is the biopsychosocial approach useful for explaining behavior and mental disorders better than a single-cause explanation?
Understanding AP Psychology Course Reference
A good psychology answer does more than name a term. It explains the evidence behind the claim and applies the term to a specific situation. When reading a study, notice who took part, how researchers measured behavior, and whether the design can support a cause claim.
A survey may reveal a pattern, but people may misremember or answer in socially acceptable ways. An experiment can test causes more carefully, yet an artificial lab setting may not fully match everyday life.
Statistical significance matters because a result can appear by chance. It does not tell you whether an effect is large, useful, or true for every person.
Biological explanations work at several levels. A behavior can involve brain regions, chemical signals, genes, hormones, and the environment. For example, stress activates the sympathetic nervous system, preparing the body for action.
The parasympathetic nervous system later helps return the body to a calmer state. Brain injury cases are useful because they show that some abilities depend strongly on particular areas, such as language production or memory formation.
Still, the brain is not a set of separate boxes. Networks communicate constantly, and neuroplasticity allows experience to strengthen, weaken, or reorganize connections over time.
Learning principles help explain habits that students see every day. A behavior that brings relief can become hard to stop, even when it causes later problems. Checking a phone may briefly reduce uncertainty, which can reinforce repeated checking.
Reinforcement schedules matter because unpredictable rewards often create persistent behavior. This helps explain repeated game play, gambling, and checking for messages. Extinction does not mean a learned response is erased forever.
A response may return after time passes or when a person enters the setting where it was learned. When studying examples, identify the behavior first, then identify the consequence that makes it more or less likely.
Memory is reconstructive rather than a perfect recording. Attention affects what enters memory, and meaning affects how well material is stored. Connecting new material to a familiar example usually supports stronger recall than rereading alone.
Retrieval practice is especially valuable because trying to bring information to mind strengthens later access. Forgetting can result from weak encoding, interference from similar information, or missing retrieval cues.
Eyewitness memory deserves careful attention for this reason. Confidence can increase after repeated questioning or feedback, even when the original memory was incomplete.
Development, personality, mental health, and social behavior show why single-cause explanations are usually too simple. Genes influence temperament and vulnerability, while family life, culture, peers, and major events shape how traits appear. A diagnosis describes a pattern of symptoms and impairment.
It is not a complete description of a person. Effective treatment may use psychological therapy, medication, social support, or a combination, depending on the problem and the evidence.
In social settings, people often underestimate situational pressure and overestimate personal traits. Pay close attention to the context in any scenario, including authority, group norms, roles, and whether others are present.