Social Psychology

Overview

Social psychology sits between psychology and sociology: it uses psychological methods to study social phenomena, focusing on the individual in social context rather than on institutions alone. Its scope includes social cognition, how people perceive and think about others; social influence, how others change attitudes and behaviour; social relations, including attraction, helping, aggression and intergroup relations; and applied work in health, law, education and organisations. Perspectives within the field include cognitive approaches emphasising schemas, heuristics and biases; motivational approaches emphasising needs for belonging, esteem and consistency; sociocultural approaches emphasising norms, roles and cultural scripts; and evolutionary approaches emphasising adaptive problems of cooperation, status and mating. A complete account usually combines several: a bystander fails to help because of cognitive diffusion of responsibility, motivational fear of embarrassment, and a norm that others will act.

Nature, scope and perspectives

Social psychology emerged from questions about crowds, suggestion, attitudes and group mind, and it became experimental when researchers began manipulating social variables under controlled conditions. Its nature is scientific and contextual: it seeks general principles, but it expects those principles to interact with culture, history and situation. Its scope is broad because almost no psychological process is purely individual: memory is shaped by conversation, emotion is shaped by display rules, and even perception is shaped by social expectation. Methods include laboratory experiments for causal clarity, field experiments for ecological validity, surveys for attitudes and behaviour at scale, and observational and archival studies for real-world patterns. Ethics is central because social experiments often involve deception, social pressure or sensitive group attitudes, so debriefing, minimal risk and respect for participants are not optional extras.

Perspectives offer different lenses on the same event. A cognitive perspective asks what schemas and attributions a person uses to interpret a stranger. A learning perspective asks what rewards and models shaped an attitude. A psychodynamic perspective asks what unconscious motives and defences shape prejudice. A sociocultural perspective asks what norms and roles make a behaviour appropriate in one setting and deviant in another. An evolutionary perspective asks what adaptive problem a tendency, such as in-group favouritism, might have solved. The field progresses when perspectives are combined and tested against each other, not when one perspective claims the whole social world. For examination purposes, always name the level of analysis: is the explanation about a mental process, a relationship, a group norm, or a cultural system? Confusing levels is a common source of weak answers.

Social perception, attitudes and prosocial behaviour

Social perception is how people form impressions of others from appearance, behaviour, speech and context. Impression formation is rapid and organised: trait inferences are drawn from thin slices of behaviour, central traits such as warmth and honesty colour other judgements, and primacy effects give early information disproportionate weight. Attribution is the process of explaining behaviour as caused by dispositions, such as personality, or by situations, such as pressure or luck. The fundamental attribution error is over-attributing others behaviour to dispositions while underweighting situation, especially for negative behaviour. The actor-observer difference reverses this for the self: actors explain their own behaviour situationally, observers explain it dispositionally. Self-serving bias attributes success internally and failure externally, protecting self-esteem. Attribution styles that are internal, stable and global for negative events are linked to helplessness and depression, showing that explanation is not mere commentary but a cause of further behaviour.

Attitudes are evaluations with cognitive, affective and behavioural components, formed through direct experience, learning, socialisation and media. They are measured by self-report scales, implicit measures and behavioural observation, each with limits: self-reports suffer social desirability, implicit measures capture associations rather than endorsed beliefs, and behaviour reflects opportunity as well as attitude. Attitudes predict behaviour best when they are strong, accessible, specific and matched to the behaviour in target, action, context and time, as in the theory of planned behaviour, which adds subjective norms and perceived control to attitude as predictors of intention and action. Attitude change follows persuasion through central routes, careful argument processing when motivation and ability are high, and peripheral routes, cues such as attractiveness or number of arguments when they are low. Cognitive dissonance adds that inconsistency between attitude and behaviour creates discomfort that is resolved by changing attitude, especially when behaviour was freely chosen and insufficiently justified.

Prosocial behaviour is voluntary action intended to benefit others, including helping, sharing, cooperating and comforting. Its determinants are situational as well as personal: bystander intervention research shows that people help less when others are present, because responsibility diffuses, evaluative apprehension rises, and pluralistic ignorance leads each person to read others inaction as evidence that no emergency exists. Mood, empathy, similarity, kinship, reciprocity norms and social responsibility norms all increase helping, while time pressure, anonymity and perceived costs decrease it. Altruism, helping without expectation of reward, is debated: empathy-altruism theory holds that empathic concern produces genuinely other-oriented helping, while egoistic accounts argue that helping always serves some self-benefit such as mood repair or social approval. The practical lesson is that helping can be increased by making need clear, assigning specific responsibility, reducing ambiguity and modelling helping behaviour.

Group and social influence

Groups change individual behaviour through presence, norms and roles. Social facilitation is improved performance on well-learned tasks and impaired performance on novel tasks in the presence of others, explained by arousal and by evaluation apprehension. Social loafing is reduced effort when individual contribution cannot be identified in a group task, reversed when contributions are identifiable, tasks are meaningful, or group identity is strong. Deindividuation in crowds and anonymous settings reduces self-awareness and accountability, increasing impulsive and norm-driven behaviour, though the norms followed are those salient in the situation, not necessarily antisocial ones. Group norms are shared expectations that regulate behaviour, and roles are expected behaviours for positions within the group; both can powerfully shape conduct even without formal enforcement.

Influence takes several forms. Conformity is changing behaviour or belief to match a group, driven by informational influence, accepting the group as a source of correct information, and normative influence, conforming to gain approval and avoid rejection. Classic line-judgement studies show substantial conformity even when the group is plainly wrong, moderated by unanimity, group size, task ambiguity and cultural values. Compliance is agreeing to a request, shaped by techniques such as foot-in-the-door, starting small and escalating; door-in-the-face, starting large and retreating to the target request; and low-ball, securing agreement then raising the cost. Obedience is following orders from an authority, and classic obedience studies show that ordinary people may obey harmful orders when authority is legitimised, responsibility is diffused, and the victim is distant, though obedience falls sharply when authority is questioned, peers dissent, or proximity increases. Group decision-making can improve through diverse information but can degrade through groupthink, where cohesion and pressure for unanimity suppress dissent, and through polarisation, where discussion shifts the group toward a more extreme version of its initial tendency. Structured dissent, devil advocacy and anonymous input are practical antidotes.

Theories of intergroup relations

Intergroup relations concern how groups perceive, evaluate and act toward one another. Prejudice is a negative attitude toward a group and its members, stereotyping is a generalised belief about group characteristics, and discrimination is unfair behaviour toward group members. These three can dissociate: a person may hold a stereotype without acting discriminatorily, or discriminate through institutional rules without personal prejudice. Realistic conflict theory holds that competition over scarce resources, such as jobs, land or status, produces hostility, while superordinate goals that require cooperation can reduce it. Social identity theory holds that people derive part of self-esteem from group membership, favour their in-group, and differentiate it from out-groups even when groups are arbitrary and no resource conflict exists, as shown by minimal group studies. Relative deprivation theory adds that perceived unfair disadvantage, compared with a reference group, fuels resentment more than absolute deprivation alone.

Other theories explain persistence and change. Authoritarian personality theory linked prejudice to rigid, conventional, authority-submissive personality patterns, though it overemphasised personality and underemphasised situation and culture. Social dominance theory emphasises hierarchies and legitimising myths that justify inequality. Contact theory holds that intergroup contact reduces prejudice when groups have equal status, common goals, institutional support and cooperative interaction, with friendship potential as a particularly powerful condition. Cognitive theories emphasise categorisation, illusory correlation, where distinctive minority behaviour is over-associated with the minority, and attribution biases such as ultimate attribution error, attributing out-group negative behaviour dispositionally and positive behaviour situationally. Prejudice reduction therefore requires more than information: it needs cooperative contact, recategorisation into a common in-group identity, perspective-taking, and institutional change that removes discriminatory rules and incentives.

Applied social psychology

Applied social psychology translates principles into interventions in health, education, law, organisations and communities. In health, social norms, modelling, self-efficacy and message framing change behaviour such as vaccination, exercise and safe practices, especially when messages are tailored, credible and paired with practical support rather than fear alone. In education, cooperative learning structures positive interdependence and individual accountability, reducing prejudice and improving achievement compared with purely competitive structures, while stereotype threat, the fear of confirming a negative stereotype, can impair performance and is reduced by reframing tasks, affirming values and emphasising malleability of ability. In law, social psychology informs eyewitness testimony, where memory is reconstructive and lineup procedures shape identification; jury decision-making, where deliberation, evidence order and pre-trial publicity matter; and persuasion in courtroom communication.

In organisations, social psychology addresses leadership, team composition, negotiation and conflict resolution, showing that participative leadership, clear norms, psychological safety and structured negotiation outperform authoritarian control and unstructured bargaining. In communities, it addresses environmental behaviour, public safety and collective action through norms feedback, commitment devices and community identity. In media and politics, it explains persuasion, propaganda, polarisation and misinformation through selective exposure, echo chambers and motivated reasoning, and it suggests correctives such as prebunking, source credibility and deliberative discussion. The applied standard is evaluation: an intervention should be tested, ideally experimentally, for its intended effect, its side effects and its durability across groups, because a plausible social intervention can backfire if it increases reactance, stigma or inequality.

Influence forms compared

Prejudice reduction conditions