AP Psychology Unit 4: Social Psychology and Personality Notes

Introduction

Behavior reflects a changing relationship among person, situation, goals, interpretation, and culture.

This unit begins with judgments about people, then moves outward to persuasion and social influence before comparing theories of personality, motivation, and emotion.

Across the unit, distinguish a construct from its measurement and a group tendency from a prediction about one person. Context changes probability; it rarely makes behavior inevitable.

Attribution and attitudes

how people interpret and evaluate

Social situations

how norms, information, authority, and responsibility alter action

Personality, motivation, and emotion

how enduring tendencies and changing processes work together

Current exam guidance: Aligned to the current 2026–27 AP Psychology framework and its emphasis on concepts, research methods, data interpretation, and evidence-based argument.

4.1

Attribution Theory and Person Perception

How do people explain behavior and form impressions of others?

Short answer

People combine information about a person with information about the situation, but attention, expectations, perspective, and culture can tilt the explanation they choose.

Know firstPerception and selective attention · Heuristics and base rates · Correlation and causal inference

The idea

An attribution is an explanation for behavior. A dispositional attribution locates the cause in the person, such as ability or effort; a situational attribution locates it in context, such as task difficulty or available resources. Good reasoning keeps both live until evidence separates them. One late arrival, for example, does not reveal whether the person is habitually careless or faced an unusual delay.

Observers often see the actor clearly while the surrounding pressures are less visible. This asymmetry can contribute to the fundamental attribution error: across some conditions, observers overemphasize disposition when explaining another person’s behavior. Actors may have more access to their changing circumstances. Neither pattern is a rule for every judgment, and findings vary with relationship, perspective, and cultural emphasis on individuals or contexts.

Impressions can also become recursive. A stereotype or halo effect changes what an observer notices and how the observer behaves; the target responds to that treatment; the response then appears to confirm the original expectation. This self-fulfilling process is possible, not automatic. To establish it, evidence must show the expectation changed treatment and that treatment changed the later response.

Attribution diagram contrasting person explanations, situation explanations, actor perspective, and observer perspective — Attribution changes with the observer’s lens
Explanations depend on which information is salient and available. A behavior alone rarely identifies whether disposition or context dominated.
Use this visual to see
Generate person and situation alternatives before selecting an attribution.
What it cannot show
The same observed behavior sits between a person lens and a situation lens. Actor and observer viewpoints highlight different information, with culture and prior expectation surrounding both.
Test Ninjas · Original educational diagram

Test person and situation explanations

Observation	Possible person factor	Possible situation factor	Evidence still needed
one missed deadline	planning habit	unexpected workload	behavior across tasks and weeks
quiet in one meeting	reserved tendency	unfamiliar group	behavior across familiar and unfamiliar settings
improved performance	greater skill	clearer instructions	comparison with a matched condition

Build a bounded attribution

State only the behavior that was observed.
Generate at least one plausible person and one plausible situation cause.
Identify evidence that would separate the explanations.
Treat a named bias as a group-level tendency, not a diagnosis of an individual.

Keep these three ideas

Attributions can emphasize people, situations, or both.
Salience and perspective influence explanation.
Impressions can alter later interaction, but the causal loop needs evidence.

Social Psychology and Personality