In 1964, a young woman named Kitty Genovese was attacked and killed outside her apartment building in Queens, New York. The story that gripped the nation — printed in The New York Times — was that 38 witnesses watched from their windows and did nothing. The number became a symbol of urban coldness.
Here's the twist you need to know: later reporting found that "38 witnesses who watched and did nothing" was badly overstated. Most "witnesses" heard a fragment, saw nothing clearly, and at least one did call police. The famous detail is, historically, mostly a myth.
But the myth launched real science. Two psychologists, John Darley and Bibb Latané, asked a question that turned out to be true even after the headline fell apart: does the number of people present change whether any one of them helps? Their answer rewired how we understand emergencies — and it isn't that people are heartless. It's something stranger, and it's happening in your group chats, your classrooms, and your stalled-out group projects right now.
Start with the simplest social fact: other people change what you do, even when they're just there.
Social facilitation is the tendency to perform better on tasks in the presence of others. Robert Zajonc (1965) gave it a precise mechanism that you must get right for the exam: the presence of others increases arousal, and arousal strengthens whatever your dominant response is — your most likely, well-practiced reaction. So presence improves performance on simple or well-learned tasks (the dominant response is correct) but worsens performance on difficult or unfamiliar tasks (the dominant response is wrong). A skilled pool player sinks more shots with a crowd watching; a beginner falls apart. Same crowd, opposite effect — because the dominant response differs.
Try This. Name your most over-practiced skill and your least practiced one. Predict, using Zajonc's arousal logic, what an audience does to each. If you predicted "audience helps the practiced skill, hurts the new one," you've got it — and you can now answer roughly 90% of social facilitation questions on the exam.
Now flip the setup. Social loafing is the tendency to exert less effort when working in a group toward a common goal than when individually accountable. The classic image: a tug-of-war where everyone "pulls," but no one pulls as hard as they would alone, because individual effort is pooled and unidentifiable. Social loafing requires a shared group output; social facilitation involves individual, evaluated performance. (That contrast is a favorite trap — see section (e).)
Crank up the anonymity further and you get deindividuation: the loss of self-awareness and self-restraint that occurs in group situations that foster anonymity and arousal. Think of people in costumes, uniforms, or large crowds doing things they'd never do alone — online mobs, looting, hazing. The group dissolves the individual sense of accountability.
Groups don't just change effort; they change judgments.
Group polarization is the tendency for a group's prevailing attitudes to become more extreme after discussion. A group that leans mildly in favor of something tends to leave the conversation leaning strongly in favor. Discussion doesn't average people toward the middle — it amplifies the direction they already leaned.
Groupthink, named by Irving Janis (1972), is the mode of thinking that occurs when the desire for group harmony and consensus overrides a realistic appraisal of alternatives. To preserve agreement, members suppress doubts, censor dissent, and pressure doubters into line — producing confident, unanimous, and sometimes catastrophic decisions. Janis analyzed fiascos like the Bay of Pigs invasion. Warning signs: an illusion of invulnerability, pressure on dissenters, and self-appointed "mindguards" who shield the group from contrary information. The fix is structural — invite dissent, assign a devil's advocate, seek outside opinions.
Back to Darley and Latané. The bystander effect is the finding that the more people present at an emergency, the less likely any one of them is to help — and the slower help comes when it comes. The driving mechanism is diffusion of responsibility: when responsibility is shared among many witnesses, each person feels less personally obligated to act ("someone else will handle it"). A second mechanism is pluralistic ignorance — people look to others to define the situation, and if everyone is staying calm, each concludes there's no emergency. In the famous smoke-filled room study, participants alone reported smoke seeping into a room quickly; participants seated with calm confederates often sat in the smoke and said nothing.
Darley and Latané described helping as a chain of decisions: you must notice the event, interpret it as an emergency, assume responsibility, know how to help, and then act. A group can break the chain at "interpret" (pluralistic ignorance) or at "assume responsibility" (diffusion).
Prejudice is an unjustified (usually negative) attitude toward a group and its members — a prejudgment with affective, cognitive, and behavioral components. A stereotype is the cognitive belief — a generalized (often overgeneralized) idea about a group. Discrimination is the behavior — unjustified negative action toward a group. Attitude, belief, action: keep them separate, because the exam separates them.
Several mechanisms feed prejudice. We sort the world into in-groups ("us") and out-groups ("them"). In-group bias is the tendency to favor our own group. Out-group homogeneity is the perception that members of the out-group are "all alike," while we see our own group as full of individuals. The just-world phenomenon is the tendency to believe the world is fair, so people get what they deserve — which subtly leads to blaming victims for their misfortune. Scapegoat theory holds that prejudice offers an outlet for anger by providing someone to blame when things go wrong. And much prejudice operates below awareness as implicit attitudes — automatic associations a person may not consciously endorse.
Prejudice isn't fixed. Two evidence-based levers:
The contact hypothesis (Gordon Allport, 1954) holds that contact between groups reduces prejudice — but only under specific conditions: the contact should involve equal status, common goals, cooperation (not competition), and support from authorities or social norms. Throwing groups together without those conditions can backfire.
Superordinate goals are shared goals that require cooperation between groups and override their differences. Muzafer Sherif's Robbers Cave study (1954, see section (c)) showed that simply mixing rival groups did little, but a goal neither group could achieve alone — restarting a stalled truck, fixing the camp's water supply — dissolved the hostility.
Three robust predictors:
Proximity — mere geographic nearness — is one of the strongest. Nearness breeds liking largely through the mere exposure effect (Zajonc again): repeated exposure to a stimulus increases liking for it. Familiarity, not novelty, breeds fondness. Physical attractiveness powerfully shapes first impressions and feeds the "what is beautiful is good" stereotype. And similarity — shared attitudes, interests, and values — predicts lasting attraction far better than the folk wisdom that "opposites attract." We like people who are near us, familiar to us, and like us.
Finally, aggression — behavior intended to harm — is shaped by biology (genes, neural systems, testosterone, alcohol), and by psychological/social triggers, especially frustration (the frustration-aggression principle: blocked goals breed anger that can spill into aggression) and modeling of aggressive behavior.
Darley & Latané — Bystander Intervention / Diffusion of Responsibility (1968).
Who & when: John Darley and Bibb Latané, Columbia and NYU, 1968, motivated (in part) by the Genovese coverage.
Method: College students participated in a discussion via intercom from separate rooms, believing they were talking with either one other person, two others, or five others. (The "others" were recordings.) Early in the discussion, one "participant" appeared to have a seizure, gasping for help over the intercom. The researchers measured whether and how quickly the real participant left to get help, as a function of how many bystanders they believed were present.
Findings: When participants believed they were the only other person, 85% sought help, and quickly. When they believed four others were also present, only 31% ever sought help, and those who did were much slower. More perceived witnesses meant less helping.
Why it matters: The result isolated diffusion of responsibility as a real cause: the same individual helps readily when responsibility is theirs alone and fails to help when responsibility is shared. It reframed bystander inaction not as moral failure but as a predictable feature of group situations — and it's the canonical study to cite on any FRQ about helping behavior.
Scenario 1. Maria is a regional spelling champion. At the school assembly, with hundreds watching, she spells flawlessly. Her friend Devon, who only started competing last week, freezes and misspells an easy word in front of the same crowd.
What's happening, and why opposite outcomes? This is social facilitation operating through Zajonc's mechanism. The audience raises arousal, which strengthens each person's dominant response. For Maria (well-practiced), the dominant response is correct, so she improves. For Devon (the task is still difficult and unlearned), the dominant response is wrong, so arousal makes him worse. Same crowd, opposite effects — the difference is task mastery.
Scenario 2. A six-person committee that mildly favored a risky merger meets for two hours. No one voices the concerns several privately held; members nod along, and a senior member shuts down the one skeptic. They leave unanimously enthusiastic about the merger.
Name the concepts. Two are in play. The drift from "mildly favor" to "strongly favor" after discussion is group polarization. The suppression of private doubts, the silencing of the dissenter, and the prizing of consensus over honest appraisal is groupthink (Janis). The "mindguard" senior member shielding the group is a classic groupthink symptom.
Scenario 3. A student collapses in a crowded campus food court. Dozens of people glance over, see that no one else is reacting, and assume it must not be serious. No one calls for help for several minutes. Later, in an empty hallway, the same kind of collapse gets immediate aid from the one passerby.
Which concepts, precisely? The crowded-court failure is the bystander effect, driven by diffusion of responsibility ("someone else will call") and pluralistic ignorance (everyone reads everyone else's calm as evidence there's no emergency). The lone passerby helps fast because responsibility is undivided — exactly the Darley & Latané pattern.
Social facilitation vs. social loafing. Both involve others, opposite effects. Facilitation = individual performance is evaluated, presence boosts (simple tasks) or hurts (hard tasks). Loafing = effort is pooled in a group with no individual accountability, so each person slacks. Tip: Facilitation = the spotlight is on YOU; loafing = you're hidden in the crowd. If output is individually visible, think facilitation; if it's blended and anonymous, think loafing.
Groupthink vs. group polarization. Both are group-decision phenomena. Group polarization = discussion makes the group's existing leaning more extreme (direction stays, intensity grows). Groupthink = desire for harmony/consensus suppresses dissent and realistic appraisal (it's about how the group decides, not which way it leans). Tip: polarization = "more of the same direction"; groupthink = "we agreed because we didn't dare disagree."
Bystander effect vs. diffusion of responsibility. Not synonyms — one explains the other. The bystander effect is the outcome (more witnesses → less helping). Diffusion of responsibility is the mechanism (shared responsibility lowers each person's felt obligation). On an FRQ, name the effect, then explain it via diffusion.
Prejudice vs. stereotype vs. discrimination. Stereotype = belief (cognition). Prejudice = attitude/feeling (affect). Discrimination = action (behavior). Mnemonic: think–feel–do. You can hold a stereotype without acting; discrimination is the behavior that crosses the line.
Four-choice MCQs in current AP format. Answers and explanations in section (h).
EBQ format. You will read three summarized peer-reviewed sources on a shared topic, then write a single response. Your response must (1) make a defensible claim, (2) support it with evidence from at least two of the sources, and (3) provide reasoning that explains how the evidence supports the claim using course concepts. 7 points: Claim (0–1) + Evidence from 2+ sources (0–3) + Reasoning & Application (0–2).
Topic: What conditions make intergroup contact effective at reducing prejudice?
Source 1. A field study placed previously segregated work crews into mixed teams. In one set of teams, the two groups were given an equal-status arrangement and a shared task that required cooperation to earn a team bonus; in another set, the groups worked side by side but competed individually for the same bonus. After eight weeks, prejudice (measured by a standardized out-group attitude scale, higher = more prejudice) dropped sharply in the cooperative, equal-status teams (from M = 6.2 to M = 3.4) but barely changed in the competitive teams (M = 6.0 to M = 5.7).
Source 2. A study of school programs compared classrooms that simply seated students from different groups together ("mere exposure") with classrooms using a structured cooperative learning method in which each student held a unique piece of information the group needed to succeed. Self-reported liking of out-group classmates rose modestly in the seating-only classrooms but rose substantially in the cooperative classrooms. Researchers noted that students in cooperative classrooms increasingly described out-group peers as distinct individuals rather than as interchangeable members of a category.
Source 3. A survey across 30 communities measured everyday intergroup contact and prejudice. Contact correlated with lower prejudice overall, but the relationship was strongly moderated by whether local institutions (schools, employers, leaders) visibly endorsed integration. Where authorities endorsed it, more contact predicted much lower prejudice; where authorities were neutral or hostile, contact predicted little or no reduction — and in a minority of hostile-authority communities, more contact predicted slightly higher prejudice.
Prompt. Using the sources, develop and defend a claim about the conditions under which intergroup contact reduces prejudice. Support your claim with evidence from at least two of the sources and explain your reasoning using psychological concepts from the course.
Claim: Intergroup contact reduces prejudice not by itself but only when specific conditions are met — particularly equal status, cooperative (rather than competitive) shared goals, and supportive institutional norms. (Claim: 1 pt — a defensible, specific position, not just "contact helps.")
Evidence + Reasoning, integrated:
Source 1 supports the claim by showing that contact reduced prejudice (out-group attitude scores fell from 6.2 to 3.4) only in the equal-status, cooperative teams, while the competitive teams — who had just as much contact — showed almost no change (6.0 to 5.7). (Evidence #1) This maps directly onto Allport's contact hypothesis, which holds that contact reduces prejudice specifically under conditions of equal status, common goals, and cooperation; the cooperative bonus functioned as a superordinate goal (à la Sherif's Robbers Cave) that the groups could only achieve together, dissolving the "us vs. them" line. (Reasoning #1)
Source 2 adds that structured cooperative contact outperformed mere seating, and that cooperative-classroom students came to see out-group peers as distinct individuals. (Evidence #2) This illustrates the reduction of out-group homogeneity — the prejudiced perception that "they're all alike." When a shared task forces meaningful individuating interaction, that overgeneralization breaks down, which is why cooperative contact reduces prejudice while passive proximity does little. (Reasoning #2)
Source 3 shows the effect is moderated by institutional support: contact predicted lower prejudice where authorities endorsed integration, but little or none where they did not. (Evidence #3 — a third source strengthens the response.) This confirms the final Allport condition — support of authorities/social norms — and shows that without it, even abundant contact can fail or backfire. (Reasoning extends the claim.)
(Evidence: 3 pts — specific, accurate evidence drawn from all three sources, well beyond the two-source minimum. Reasoning & Application: 2 pts — explicitly connects evidence to named course concepts: contact hypothesis, superordinate goals, out-group homogeneity.)
1. (B) Simple or well-learned. Zajonc: arousal from others' presence strengthens the dominant response, which is correct on simple/well-learned tasks. (A) is the opposite — presence hurts difficult tasks. (C) and (D) don't fit the facilitation paradigm; (D) describes loafing conditions.
2. (C) Group polarization. Discussion intensified a pre-existing leaning. (A) groupthink is about suppressing dissent for harmony, not described here; (B) loafing is about effort; (D) deindividuation is loss of restraint in anonymous crowds.
3. (C) Decreased. More perceived bystanders → less helping, via diffusion of responsibility (85% alone vs. 31% with four others). (A) is backwards; (B) contradicts the finding; (D) misstates the monotonic decline.
4. (A) Just-world phenomenon. The belief that the world is fair and people get what they deserve. (B) is the "they're all alike" perception; (C) is familiarity → liking; (D) is favoring one's own group.
5. (B) Social loafing. Reduced individual effort under a pooled, non-accountable group score. (A) facilitation needs individual evaluation; (C) groupthink concerns decision-making; (D) bystander effect concerns emergencies/helping.
6. (C) Groupthink. Desire for harmony/consensus overrode realistic appraisal; doubts suppressed, dissenter pressured (a "mindguard"). (A) polarization is about extremity of leaning; (B) and (D) don't fit.
7. (B) Introducing superordinate goals requiring cooperation. Sherif found shared goals neither group could meet alone reduced hostility. (A) mere contact (shared dining) did not reduce it; (C) leaders weren't the mechanism; (D) competition created the hostility.
8. (B) Have seen the stranger's face many times before. Mere exposure: repeated exposure breeds liking. (A) is the "beautiful/wealthy = good" halo, not mere exposure; (C) reduces liking; (D) contradicts the similarity principle.
9. (B) Deindividuation. Loss of self-awareness/self-restraint in an anonymous, aroused crowd. (A) facilitation is about task performance; (C) polarization is about decision extremity; (D) is a prejudice-reduction principle.
10. (B) Equal status, common goals, cooperation, and institutional support. Allport's four conditions. (A) and (D) describe conditions that worsen relations; (C) "casual exposure" without shared goals tends not to work.
11. (B) Diffusion of responsibility increasing with the number of bystanders. Help rate falls as bystanders rise (85%→31%), the signature bystander-effect pattern explained by diffusion. (A) facilitation predicts the opposite and concerns task performance, not helping; (C) polarization is unrelated; (D) concerns attraction.
12. (B) Out-group homogeneity. Seeing the out-group as "all alike" while seeing one's own group as varied individuals. (A) is favoring one's own group; (C) is the fairness belief; (D) concerns effort.
13. (B). Stereotype = belief (cognition), prejudice = attitude/feeling (affect), discrimination = action (behavior): think–feel–do. The other options scramble the mapping.
14. (B) Pluralistic ignorance. Participants use the confederates' calm to interpret the smoke as a non-emergency. (A) loafing concerns effort; (C) polarization concerns decision extremity; (D) concerns attraction. (Diffusion of responsibility also operates in bystander research, but the interpretation-from-others mechanism described here is specifically pluralistic ignorance.)
15. (C) Social loafing. Reduced individual effort within a pooled group task (the classic tug-of-war demonstration). (A) facilitation requires individual evaluation; (B) deindividuation is loss of restraint, not reduced effort; (D) concerns prejudice.
| Component | Points | Criteria |
|---|---|---|
| Claim | 0–1 | 1 pt for a defensible, specific claim that answers the prompt (names conditions, not just "contact helps"). 0 if missing, vague, or contradicts the sources. |
| Evidence | 0–3 | 1 pt per source accurately used to support the claim, up to 3; must use at least 2 sources for credit beyond 1. Evidence must be specific (findings/numbers), not vague paraphrase, and not fabricated. |
| Reasoning & Application | 0–2 | 1 pt for explaining how the evidence supports the claim (not just restating it); +1 pt for correctly applying a named course concept (e.g., contact hypothesis, superordinate goals, out-group homogeneity). |
| Total | 7 | |
PsyIQ · Lesson 23 of 30 · Unit 4: Social Psychology and Personality. FRQ practice this lesson is an Evidence-Based Question (EBQ) — Claim + Evidence (2+ sources) + Reasoning, scored on the 7-point redesigned (2025+) AP Psychology rubric. Not affiliated with the College Board. AP is a registered trademark of the College Board. Content pending external psychology QC.