Difficulty: Intermediate | Prerequisites: Basic understanding of social facilitation concepts and social identity theory is helpful.
Being around other people changes how we perform, how hard we try and how we behave. The presence of others can improve performance on easy tasks (social facilitation) but hurt it on hard ones (social inhibition). In groups, people sometimes coast (social loafing), lose their individual identity (deindividuation) or become more extreme in their views (group polarization). Social identity theory ties most of these phenomena together.
Social facilitation
The strengthening of dominant responses in the presence of others. On well-learned tasks, performance improves; on novel or complex tasks, performance worsens. Think of it as: other people turn up whatever response you would already give.
Social inhibition
Decreased performance on difficult or unfamiliar tasks in the presence of others. It is the flip side of social facilitation: the same arousal mechanism that helps you on easy tasks hurts you on hard ones.
Mere presence / drive theory
The idea that there is an innate, biologically basic social arousal mechanism triggered simply by the presence of conspecifics (other members of the same species). Found across species, including cockroaches.
Evaluation apprehension
The enhancement of dominant responses is strongest when people believe they are being evaluated. Expectations of rewards or punishments from performing a task lead to arousal.
Distraction-conflict theory
When we wonder how co-actors or an audience are reacting, attentional conflict arises, which produces arousal that spills over into task performance.
Social loafing
The tendency of individuals to exert less effort toward a common goal than they would if individually accountable. Think of it as free-riding: effort decreases as group size increases.
Deindividuation
A state in which individuals act in groups and no longer think of themselves as individuals. The early view held this leads to antinormative behaviour; the contemporary view holds it leads to heightened sensitivity to situational norms.
Social Identity Model of Deindividuation Effects (SIDE)
Emphasises that deindividuation does not cause a loss of self. Instead, it makes social identities and group norms more salient. What people do while deindividuated depends on which identity is active.
Group polarization
Group-produced enhancement of members' pre-existing tendencies. After group discussion, the average position of the group becomes more extreme in the direction it was already leaning.
Risky shift
The early finding that people accept more risk after group deliberation. Later research showed this was a special case of group polarization: groups shift toward whatever direction the members already lean, not always toward risk.
Social facilitation is the strengthening of dominant responses in the presence of others. It improves performance on tasks that are highly practised and well-learned (e.g. experienced chess players performing better in tournaments). Social inhibition is the opposite: decreased performance on novel or complex tasks (e.g. giving your brother's wedding speech for the first time).
The mechanism: others' presence causes arousal, which strengthens dominant responses. If the dominant response is correct (easy task), performance improves. If the dominant response is incorrect (hard task), performance worsens.
Three explanations for the arousal
Mere presence / drive theory: an innate social arousal mechanism, biologically basic and found across species.
Evaluation apprehension: arousal is strongest when people think they are being evaluated. Expectations of rewards or punishments from the task drive the arousal.
Distraction-conflict: wondering how co-actors are doing or how the audience is reacting creates attentional conflict, which produces arousal that spills over to performance.
Zajonc's cockroach experiment
Tasks set for cockroaches to escape: easy runway vs. hard maze; alone vs. with other cockroaches present.
Results: cockroaches were faster in social conditions on the easy runway but slower in social conditions on the hard maze.
Relevance: cockroaches cannot experience evaluation apprehension or complex distraction, so this supports the mere presence explanation as sufficient for social facilitation. However, it does not rule out the other explanations in humans.
Mere presence is not necessary (human study)
Participants did a paired word association task (simple and complex versions). Conditions: presence or absence of experimenter, evaluation condition, distraction condition, and both combined.
Results: actual physical presence of another person was not necessary for social facilitation to occur. Both evaluation and distraction manipulations independently produced social facilitation effects. The additive effect of evaluation plus distraction appeared only on complex tasks (more inhibition).
Takeaway: evaluation apprehension and distraction are each sufficient to produce social facilitation in humans, and mere presence is not strictly required.
Social loafing is the tendency to exert less effort toward a common goal than one would if individually accountable. It reflects free-riding and diffusion of individual responsibility. Effort decreases as group size increases.
Two conditions that reduce social loafing
Having a social identity: explicitly labelling a collection of individuals as a group reduces loafing. The stronger the group manipulation (greater sense of being in a group), the more people feel group behaviour will reflect on them.
Increasing visibility of individuals and having out-groups present.
Social identity theory and social loafing
Social identity theory holds that group membership is the primary determinant of identity. Being part of a group enhances identification with other members and with the group's goals. Under high identification, group performance can outperform individual performance. Social loafing occurs when individuals are placed in loose collectives and increases with group size.
Study: tested whether introducing an out-group would reduce loafing for identified groups, and whether wearing a uniform would reduce personal identifiability (increase loafing) but have the opposite effect in identified groups.
Results: presence of an out-group increased identification with the group and reduced social loafing, facilitating performance. Wearing a uniform increased anonymity within the group. In the out-group setting, the group was internally more cohesive. Without an out-group, uniforms increased perceived opportunities for loafing.
Deindividuation is a state in which individuals act in groups and no longer think of themselves as individuals.
Early view: deindividuation leads to antinormative (antisocial) behaviour.
Contemporary view: deindividuation leads to heightened sensitivity to situational norms, which can be prosocial or antisocial depending on context.
KKK/nurses study (why the early view was abandoned)
Participants did a fake shock-learning task, four at a time in separate cubicles. Conditions: prosocial cues (nurse outfits) vs. antisocial cues (KKK outfits), crossed with individuation (names identifiable) vs. deindividuation (not identifiable).
Results: the valence of the situational cues (prosocial or antisocial) influenced shock levels. Deindividuated participants followed the situational norms to a greater degree than individuated participants.
Takeaway: deindividuation can lead to prosocial behaviour. It promotes following whatever norms the situation implies, not just antisocial behaviour.
Social Identity Model of Deindividuation Effects (SIDE)
SIDE emphasises that there is no loss of self during deindividuation. Instead, deindividuation makes social identities and categories more salient. The effects depend on which identity is assumed during the process.
Study: Singaporean gamers surveyed about gaming habits. 70% cheated occasionally. The more often people played anonymously, the more they cheated and the more they identified with online gaming. More identified gamers cheated more.
This supports SIDE: anonymous play made the gamer identity more salient, and cheating was a norm within that identity.
Group polarization is the group-produced enhancement of members' pre-existing tendencies. After discussion, the average position becomes more extreme in the direction it was already leaning.
Example: Boulder/Colorado Springs political discussion. People discussed political topics in groups and became more convinced that their ideological positions were correct, with more extreme positions after deliberation than before.
From risky shift to group polarization
Early findings suggested groups always shift toward risk. But the "married parent with two children gambling on the stock market" scenario produced the reverse effect (shift toward caution). Group deliberation polarizes opinions in the direction of the existing group median, enhancing the average attitudes of members.
Three factors explaining group polarization
Informational influence: discussion leads to an exchange of arguments. Under high motivation, people learn new arguments (central route); under low motivation, sheer volume of arguments matters (peripheral route).
Social comparison: people want to be good group members and typically underestimate existing group support for an issue, so they shift further in the group's direction.
Group identification: members enhance the status of their group relative to the out-group. Deindividuation manipulations can also induce polarization.
Students often think social facilitation always improves performance. It does not. It strengthens dominant responses, which means it impairs performance on novel or difficult tasks.
Students often think deindividuation always leads to aggression or antisocial behaviour. The KKK/nurses study showed that deindividuated people follow whatever norms the situation provides, including prosocial ones.
Students often confuse social facilitation with social loafing. They operate in opposite directions: facilitation increases effort on individual performance in front of others, while loafing decreases effort on collective tasks where individual contributions are hidden.
Students often think group polarization means groups become extreme in a random direction. Groups polarize in the direction of their pre-existing average, not toward any arbitrary extreme.
⚠️ Be able to define social facilitation and give two examples: one where performance improves (well-learned task) and one where it worsens (novel task).
⚠️ Know the three arousal explanations (mere presence, evaluation apprehension, distraction) and be ready to state how each works.
⚠️ Be prepared to describe the Zajonc cockroach study and explain what it shows about mere presence.
⚠️ Know the definition of social loafing and at least two conditions that reduce it (social identity, visibility, out-groups).
⚠️ Be ready to contrast the early and contemporary views of deindividuation and describe the KKK/nurses study.
⚠️ Understand group polarization and be able to name its three explanatory factors (informational influence, social comparison, group identification).
True or False: Zajonc's cockroaches performed better on the hard maze in social conditions. (False. They performed worse on the maze and better on the easy runway.)
Fill in the blank: Social loafing increases as group _____ increases. (size)
True or False: In the KKK/nurses study, deindividuated participants in nurse outfits gave higher shocks than individuated participants. (False. Deindividuated participants in nurse outfits gave lower shocks, following the prosocial norm.)
Fill in the blank: Group polarization is the group-produced enhancement of members' _____ tendencies. (pre-existing)
Q: Define social facilitation and explain why it sometimes improves and sometimes decreases performance.
A: Social facilitation is the strengthening of dominant responses in the presence of others. Others' presence causes arousal, which amplifies whatever response is most natural. On well-learned tasks the dominant response is correct, so performance improves. On novel or complex tasks the dominant response is often incorrect, so performance worsens (social inhibition).
Q: Describe the Zajonc cockroach study and explain its relevance to understanding social facilitation.
A: Cockroaches were given an easy runway or a hard maze to escape, either alone or with other cockroaches present. In social conditions, cockroaches were faster on the easy runway but slower on the hard maze. This supports the mere presence/drive theory explanation: cockroaches cannot experience evaluation apprehension, yet social facilitation still occurred, showing that mere presence of conspecifics is sufficient to produce the effect.
Q: How does social identity theory explain social loafing? Describe one study.
A: Social identity theory holds that group membership determines identity. Under high group identification, people internalise group goals and effort increases. Loafing occurs in loose collectives where identification is weak. In a study, introducing an out-group reduced loafing for identified groups because it increased group identification. Wearing a uniform (reducing personal identifiability) increased loafing without an out-group, but in the out-group condition it made the group more cohesive and reduced loafing.
Q: How does the SIDE model explain the effects of deindividuation? Give one empirical example.
A: The SIDE model holds that deindividuation does not cause a loss of self but instead makes social identities more salient. Behaviour depends on which identity is active during deindividuation. In a study of Singaporean gamers, 70% cheated occasionally. The more often players were anonymous, the more they cheated and the more they identified with the gamer identity. This supports SIDE: anonymity made the gamer social identity (where cheating was normative) more salient.
Social facilitation connects to the arousal and performance research in cognitive psychology. Social loafing and deindividuation both connect to social identity theory, which is also central to understanding prejudice (in-group bias and out-group derogation). Group polarization connects to persuasion through informational influence (the ELM's central and peripheral routes apply to how group members process new arguments during discussion).
Social facilitation, social inhibition, dominant response, arousal, mere presence, drive theory, Zajonc, cockroach experiment, evaluation apprehension, distraction-conflict, social loafing, free-riding, diffusion of responsibility, deindividuation, SIDE model, social identity model, KKK nurses study, group polarization, risky shift, informational influence, social comparison, group identification, social identity theory, NYU social psychology