Social Psychology

Social psychology studies how people's thoughts, feelings, and behaviors are influenced by the actual, imagined, or implied presence of others (Allport, 1954). It sits at the intersection of psychology and sociology, sharing sociology's interest in group processes but keeping the individual as the unit of analysis. The field's most powerful findings demonstrate that situations shape behavior far more than most people intuit -- a lesson learned repeatedly through landmark experiments on conformity, obedience, and helping behavior.

Agent affinity: hooks (intersectionality, social justice, power dynamics), vygotsky (social-cultural context), kahneman (social judgment biases)

Concept IDs: psych-social-influence, psych-prejudice-stereotyping, psych-prosocial-behavior, psych-attribution-theory

Social Psychology at a Glance

#	Domain	Core Question	Landmark Study
1	Conformity	When and why do people align with group norms?	Asch (1951) line experiments
2	Obedience	Why do people follow destructive orders?	Milgram (1963) shock experiments
3	Attitudes	How are attitudes formed, maintained, and changed?	Festinger (1957) cognitive dissonance
4	Group dynamics	How does being in a group change individual behavior?	Janis (1972) groupthink
5	Prejudice	What causes prejudice and how can it be reduced?	Sherif (1954) Robbers Cave; Allport (1954) contact hypothesis

Domain 1 -- Conformity

Asch's line experiments

Solomon Asch (1951) showed participants a standard line and three comparison lines. In a group of confederates who unanimously gave the wrong answer, approximately 75% of participants conformed at least once across 12 trials. On any given trial, the conformity rate was about 37%. Participants were not uncertain -- the correct answer was obvious. They conformed to avoid social rejection.

Types of social influence

• Informational influence -- conforming because you genuinely believe others have better information. Dominant in ambiguous situations (Sherif's autokinetic effect, 1935).
• Normative influence -- conforming to be accepted and avoid rejection, even when you know the group is wrong. Dominant in Asch's unambiguous task.

Factors affecting conformity

Factor	Effect on conformity
Group size	Increases up to ~3-4, then plateaus
Unanimity	One dissenter reduces conformity dramatically (~25% drop)
Task difficulty	Ambiguity increases conformity
Cultural context	Collectivist cultures show higher conformity rates (Bond & Smith, 1996)
Public vs. private	Conformity drops sharply when responses are anonymous
Status of group members	Higher-status members produce more conformity

Minority influence

Moscovici (1969) demonstrated that a consistent minority can shift the majority's private beliefs over time. The key factor is consistency -- a minority that wavers has no influence. Minority influence operates through informational processes (people think harder about consistent minority positions) and tends to produce private attitude change rather than public compliance.

Domain 2 -- Obedience

Milgram's experiments

Stanley Milgram (1963) found that 65% of participants administered the maximum 450-volt shock to a screaming, eventually silent confederate, when instructed by an experimenter in a lab coat. This was not sadism -- participants showed extreme distress (sweating, trembling, nervous laughter). They obeyed because the situation was structured to elicit obedience.

Situational factors

Milgram ran systematic variations that reveal the power of situational factors:

Variation	Obedience rate	Why
Baseline (experimenter in room)	65%	Full authority presence
Experimenter gives orders by phone	21%	Reduced authority salience
Learner in same room	40%	Increased victim salience
Participant must force learner's hand onto shock plate	30%	Physical proximity to suffering
Two experimenters disagree	0%	Conflicting authority releases the participant
Ordinary person (no lab coat) gives orders	20%	Authority stripped of legitimacy
Participant sees others disobey	10%	Social proof of disobedience

The agentic state

Milgram proposed that participants entered an "agentic state" -- shifting from autonomous moral agents to agents of authority, deferring moral responsibility to the experimenter. This mechanism explains obedience in bureaucratic systems: each person follows orders, no one takes responsibility.

Ethical legacy

Milgram's experiments would not pass modern IRB review. They caused genuine psychological distress. But they revealed something important: ordinary people can perform harmful acts under situational pressure. The findings remain relevant to understanding Abu Ghraib, corporate fraud, and everyday complicity.

Domain 3 -- Attitudes

Attitude structure

Attitudes have three components (the ABC model):

• Affective -- emotional reaction ("I feel anxious around snakes")
• Behavioral -- action tendency ("I avoid snakes")
• Cognitive -- beliefs ("snakes are dangerous")

Cognitive dissonance

Festinger (1957) proposed that holding two contradictory cognitions creates psychological discomfort (dissonance) that motivates change. The classic experiment (Festinger & Carlsmith, 1959): participants who were paid $1 to lie about a boring task rated it as more enjoyable than those paid $20. The $1 group had insufficient external justification, so they reduced dissonance by changing their attitude ("maybe it wasn't so boring").

Dissonance drives post-decision rationalization (spreading of alternatives), effort justification (hazing increases group loyalty), and selective exposure to confirming information.

Persuasion

The Elaboration Likelihood Model (Petty & Cacioppo, 1986) distinguishes two routes:

• Central route -- careful evaluation of message content. Requires motivation and ability. Produces durable attitude change.
• Peripheral route -- reliance on superficial cues (source attractiveness, number of arguments, emotional appeals). Requires less effort. Produces temporary attitude change.

Cialdini (2001) identified six principles of influence: reciprocity, commitment/consistency, social proof, authority, liking, and scarcity. Each exploits automatic psychological tendencies.

Attitude-behavior gap

Attitudes predict behavior imperfectly. LaPiere (1934) traveled with a Chinese couple to 251 establishments and was refused service once, but 92% of the same establishments later said they would not serve Chinese patrons. Ajzen's (1991) Theory of Planned Behavior improved prediction by adding subjective norms (what others think I should do) and perceived behavioral control (whether I believe I can do it).

Domain 4 -- Group Dynamics

Social facilitation

Zajonc (1965) resolved decades of contradictory findings: the presence of others improves performance on simple/well-learned tasks (facilitation) but impairs performance on complex/novel tasks (inhibition). The mechanism is arousal -- others increase physiological arousal, which enhances dominant responses. If your dominant response is correct (simple task), you perform better; if it is incorrect (complex task), you perform worse.

Social loafing

Latane, Williams, and Harkins (1979) showed that people exert less effort when working collectively than individually. The effect is reduced by making individual contributions identifiable, increasing task importance, and working with valued group members. Collectivist cultures show less social loafing than individualist cultures (Karau & Williams, 1993).

Groupthink

Janis (1972) analyzed foreign policy disasters (Bay of Pigs, Pearl Harbor) and identified groupthink -- a mode of thinking in highly cohesive groups where the desire for unanimity overrides realistic appraisal. Symptoms include illusion of invulnerability, collective rationalization, stereotyping of out-groups, self-censorship, and illusion of unanimity. Prevention: assign a devil's advocate, encourage dissent, invite outside experts, use anonymous polling.

Deindividuation

Zimbardo (1969) proposed that anonymity, diffused responsibility, and arousal cause deindividuation -- the loss of self-awareness and individual accountability. The Stanford Prison Experiment (1971), despite methodological criticisms (Haslam & Reicher, 2012), demonstrated how assigned roles in institutional contexts can produce abusive behavior. Modern research emphasizes that deindividuation increases sensitivity to situational norms (SIDE model) rather than simply releasing aggression.

Domain 5 -- Prejudice

Definitions

• Prejudice -- negative attitude toward a group and its members
• Stereotyping -- cognitive component -- generalized beliefs about group characteristics
• Discrimination -- behavioral component -- unjustified negative actions against group members

Roots of prejudice

Social identity theory (Tajfel & Turner, 1979): people derive self-esteem from group membership and enhance it by favoring the in-group over out-groups. The minimal group paradigm shows that even arbitrary group assignments (overestimators vs. underestimators) produce in-group favoritism.

Realistic conflict theory (Sherif, 1954): competition for scarce resources produces intergroup hostility. Sherif's Robbers Cave experiment showed that competitive games between two groups of boys produced intense hostility, reduced only when superordinate goals (requiring cooperation) were introduced.

Implicit bias (Greenwald et al., 1998): the Implicit Association Test (IAT) measures automatic associations between social categories and evaluative attributes. Most people show implicit preferences for dominant groups even when they explicitly reject prejudice. The relationship between implicit bias and discriminatory behavior is debated (Oswald et al., 2013) but the existence of the associations is well-established.

Stereotype threat

Steele and Aronson (1995) showed that making race salient before a test reduced Black students' performance, while the same test without racial salience produced no performance gap. The mechanism is anxiety and cognitive load: awareness that one's group is stereotyped as inferior consumes working memory resources. Stereotype threat has been demonstrated across many groups and domains (women in math, older adults in memory tasks, white men in athletics).

Reducing prejudice

Contact hypothesis (Allport, 1954): intergroup contact reduces prejudice under four conditions: equal status, common goals, cooperation, and institutional support. Pettigrew and Tropp's (2006) meta-analysis of 515 studies confirmed that contact reliably reduces prejudice, even when Allport's conditions are not fully met, though the conditions strengthen the effect.

Perspective-taking -- imagining another person's experience increases empathy and reduces automatic bias (Galinsky & Moskowitz, 2000).

Intergroup dialogue -- structured conversations across group boundaries that address power, privilege, and difference. Most effective when facilitated, sustained, and embedded in institutional change.

Cross-References

• hooks agent: Critical analysis of how power structures, intersectionality, and systemic inequality shape the social psychological phenomena described here.
• vygotsky agent: The social-cultural context in which social psychological processes develop and operate.
• kahneman agent: Cognitive biases and heuristics that operate in social judgment (attribution errors, stereotyping as cognitive shortcuts).
• cognitive-psychology skill: Cognitive processes underlying social cognition -- attention, memory, and judgment in social contexts.
• clinical-foundations skill: When social psychological processes go wrong -- social anxiety, depression's social withdrawal cycle, personality disorders in interpersonal context.
• research-methods-psych skill: Experimental methods used in social psychology, including ethical considerations raised by Milgram and Zimbardo.

References

• Allport, G. W. (1954). The Nature of Prejudice. Addison-Wesley.
• Asch, S. E. (1951). Effects of group pressure on the modification and distortion of judgments. In H. Guetzkow (Ed.), Groups, Leadership, and Men. Carnegie Press.
• Cialdini, R. B. (2001). Influence: Science and Practice. 4th edition. Allyn & Bacon.
• Festinger, L. (1957). A Theory of Cognitive Dissonance. Stanford University Press.
• Janis, I. L. (1972). Victims of Groupthink. Houghton Mifflin.
• Milgram, S. (1963). Behavioral study of obedience. Journal of Abnormal and Social Psychology, 67(4), 371-378.
• Steele, C. M., & Aronson, J. (1995). Stereotype threat and the intellectual test performance of African Americans. Journal of Personality and Social Psychology, 69(5), 797-811.
• Tajfel, H., & Turner, J. C. (1979). An integrative theory of intergroup conflict. In W. G. Austin & S. Worchel (Eds.), The Social Psychology of Intergroup Relations. Brooks/Cole.