PS9: Crowd & Collective Behaviour
How groups behave: deindividuation, social identity theory, in-group and out-group behaviour, prejudice and discrimination, and how crowds can become aggressive or prosocial.
Crowd & Collective Behaviour
How groups behave: deindividuation, social identity theory, in-group and out-group behaviour, prejudice and discrimination, and how crowds can become aggressive or prosocial.
Key Fact: Deindividuation: losing your sense of personal identity in a crowd, which can lead to behaviour you would not normally do. Anonymity (e.g. uniforms, masks) reduces self-awareness and increases conformity to group norms.
Key Fact: Social Identity Theory (Tajfel & Turner): we derive part of our identity from group membership. Process: social categorisation -> social identification -> social comparison. This can lead to in-group favouritism and out-group discrimination.
Key Fact: Tajfel's minimal group paradigm: even when groups are assigned arbitrarily (e.g. preference for Klee vs Kandinsky), participants favoured their in-group. This shows that even meaningless group distinctions create bias.
Key Fact: Prejudice: a negative attitude towards a group based on stereotypes. Discrimination: unfair treatment based on group membership. Causes: social identity, scapegoating, media representations, and authoritarian personality.
Key Fact: Reducing prejudice: intergroup contact (Allport's contact hypothesis), superordinate goals (Sherif's Robbers Cave experiment), and education about stereotyping.
📋 Key Vocabulary and Concepts
For Crowd & Collective Behaviour, you must know:
- Deindividuation
- Social identity theory
- Social categorisation
- Social identification
- Social comparison
- In-group
- Out-group
- In-group favouritism
- Minimal group paradigm
- Prejudice
- Discrimination
- Stereotype
- Scapegoating
- Superordinate goals
- Contact hypothesis
❓ Practice Questions
Q1: Explain how deindividuation can lead to both antisocial and prosocial behaviour in crowds.
Q2: Describe Tajfel's minimal group paradigm and evaluate what it tells us about prejudice.
Q3: Evaluate methods for reducing prejudice, referring to psychological research.
✅ Answers
- Deindividuation reduces personal accountability - people follow group norms. In an antisocial crowd (riot), anonymity leads to aggression because the group norm is destructive. In a prosocial crowd (charity run), anonymity leads to helpfulness because the group norm is supportive.
- Tajfel showed that even arbitrary group divisions create in-group favouritism. This demonstrates that prejudice arises from the basic cognitive process of categorisation. Limitation: the paradigm is artificial - real-world prejudice involves history, power, and material conflict.
- Contact hypothesis: prejudice reduces when groups interact under equal status, cooperation, and shared goals. Sherif's Robbers Cave: hostile groups reconciled when they worked together on superordinate goals. Evaluation: contact works under optimal conditions but may backfire if groups compete.
🎯 Exam Tips
- Deindividuation = losing personal identity in a crowd. Behaviour follows GROUP NORMS (good or bad).
- Social Identity Theory: Categorise -> Identify -> Compare. 'Us vs Them' thinking is automatic.
- Reduce prejudice: contact + superordinate goals + equal status + education.
📝 Exam Technique
Psychology Exam Tips:
When evaluating crowd behaviour and prejudice, consider: lab vs real-world, cultural factors, and practical applications (how can findings reduce discrimination in schools and workplaces?).
When evaluating crowd behaviour and prejudice, consider: lab vs real-world, cultural factors, and practical applications (how can findings reduce discrimination in schools and workplaces?).
⚠️ Common Errors
Watch Out!
Students often make mistakes here. Wrong: Crowds always make people behave more aggressively than they would alone. Correct: Deindividuation theory shows that crowds lead people to follow group norms - which can be aggressive or prosocial. Johnson & Downing (1979) found that participants in KKK-style uniforms gave more shocks (antisocial norm), but those in nurses' uniforms gave fewer shocks (prosocial norm). The crowd amplifies the existing group norm.
✍️ Model Answer
Full-Mark Response
Evaluate the view that prejudice is an inevitable consequence of group membership.
A grade 9 response will: explain SIT (categorisation creates in-group favouritism automatically); support with Tajfel's minimal group paradigm; evaluate (SIT shows bias is basic to group membership); counter-argument (prejudice levels vary across cultures and time, contact reduces prejudice, superordinate goals create cooperation); conclude: while the cognitive processes are basic, the expression of prejudice is not inevitable - it depends on social context and whether conditions promote intergroup contact.
📊 AO Deep Dive
Assessment Objective Focus: Crowd & Collective Behaviour
AO1 — Knowledge: Demonstrate knowledge of Crowd & Collective Behaviour including key definitions, research studies and psychological terminology.
AO2 — Application: Apply your understanding of Crowd & Collective Behaviour to real-world scenarios and given contexts. Use research evidence to support your points.
AO3 — Analysis & Evaluation: Evaluate psychological theories and studies related to Crowd & Collective Behaviour, considering methodological strengths and weaknesses, and reaching a balanced conclusion.
📝 Exam Questions by Topic
🎬 Video Resources
Detailed Notes
Key Studies and Theories in Crowd & Collective Behaviour
Crowd & Collective Behaviour is a core topic in GCSE Psychology that requires understanding of key studies, theories and research methods. The AQA, OCR and Edexcel specifications all require you to know specific studies in detail, evaluate their methodology, and apply psychological concepts to real-life scenarios. When studying crowd & collective behaviour, focus on: the aims, methods, results and conclusions of key studies; the strengths and weaknesses of the research methods used; and how psychological understanding of crowd & collective behaviour applies to everyday life.
Key studies in this area typically use specific research methods such as experiments, observations, self-report (questionnaires and interviews), or correlational analysis. When evaluating studies, consider: reliability (can the study be replicated?); validity (does it measure what it claims to measure?); ethics (were participants protected from harm?); generalisability (can the findings be applied beyond the study sample?); and usefulness (does the research have practical applications?).
GCSE Psychology emphasises the application of psychological knowledge to real contexts. You must be able to explain how understanding of crowd & collective behaviour can be used to improve people’s lives, influence policy, or solve practical problems.
GCSE Example: Key Studies and Theories in Crowd & Collective Behaviour
When writing about a study related to crowd & collective behaviour, use the AMRC format: Aim (what was the study trying to find out?), Method (how was it conducted — design, sample, procedure?), Results (what were the key findings?), Conclusions (what do the results mean?).
Evaluating Research in Crowd & Collective Behaviour
Evaluation is a crucial skill in GCSE Psychology. When evaluating studies related to crowd & collective behaviour, use the GRAVE method: Generalisability (can the findings be applied to the wider population?), Reliability (are the results consistent if the study is repeated?), Applications (how can the findings be used in real life?), Validity (does the study measure what it claims to measure?), and Ethics (were participants treated ethically?).
Research methods commonly used in crowd & collective behaviour research include: laboratory experiments (high control but low ecological validity), field experiments (more realistic but less control), natural experiments (no manipulation of variables), case studies (in-depth but not generalisable), questionnaires (large samples but social desirability bias), and observations (natural behaviour but ethical concerns). Each method has strengths and limitations that must be evaluated in context.
Ethical issues in crowd & collective behaviour research include: informed consent (participants must agree to take part), debriefing (explaining the true purpose after the study), confidentiality (protecting participants’ identities), protection from harm (no physical or psychological damage), and right to withdraw (participants can leave at any time). The BPS Code of Conduct governs ethical standards in UK psychological research.
GCSE Example: Evaluating Research in Crowd & Collective Behaviour
When evaluating Milgram’s obedience study, you might note: low generalisability (all male, American sample); high reliability (standardised procedure with 65% obedience rate); useful applications (understanding wartime atrocities); low ecological validity (artificial laboratory setting); and serious ethical concerns (deception, psychological distress).
Applying Crowd & Collective Behaviour to Real Life
GCSE Psychology requires you to apply psychological understanding of crowd & collective behaviour to everyday situations. Consider how the theories and studies you have learned about explain real behaviour: How does crowd & collective behaviour affect people in schools, workplaces, families and communities? What interventions or strategies could improve outcomes based on psychological evidence?
When applying crowd & collective behaviour to real-life scenarios, use the following structure: identify the relevant psychological concept, explain how it applies to the scenario, support your explanation with evidence from a named study, and evaluate the strength of the application (are there limitations or alternative explanations?).
The most effective GCSE Psychology answers show a clear link between theory, evidence and application. Avoid vague statements like ‘psychology can help’ — instead, specify which psychological concept applies, which study supports it, and exactly how it could be used in the given scenario.
GCSE Example: Applying Crowd & Collective Behaviour to Real Life
A strong application answer: ‘Understanding of crowd & collective behaviour could help in schools by [specific application]. This is supported by [named study] which found that [specific finding]. This means that [specific practical recommendation]. However, a limitation is [specific weakness of applying this research].’
Comparison Table
| Evaluation Criterion | What It Means | How to Assess It |
|---|---|---|
| Generalisability | Can findings apply beyond the sample? | Consider sample size, representativeness, culture |
| Reliability | Are results consistent if repeated? | Standardised procedures, replicability |
| Validity | Does it measure what it claims? | Ecological validity, construct validity |
| Ethics | Were participants protected? | Consent, debriefing, protection from harm |
| Applications | Is the research useful? | Practical implications, real-world relevance |
Additional Practice Questions
Q: Describe one study related to crowd & collective behaviour and evaluate its methodology using the GRAVE method.
A: A key study in crowd & collective behaviour investigated [aim] using [method] with [sample]. The results showed [key finding], leading to the conclusion that [interpretation]. Evaluation: Generalisability — limited by [sample issue]; Reliability — strengthened by [standardisation]; Applications — useful for [practical application]; Validity — limited by [validity concern]; Ethics — problematic because [ethical issue]. Overall, the study makes a valuable contribution but has limitations that should be considered when applying the findings.
Q: Explain how psychological understanding of crowd & collective behaviour could be applied to improve a real-life situation.
A: Understanding of crowd & collective behaviour can be applied to improve [specific situation]. Research by [named psychologist] found that [key finding], which suggests that [practical recommendation]. For example, in a school context, this understanding could lead to [specific intervention] which would benefit people by [specific improvement]. However, individual differences mean that not everyone will respond the same way, so a personalised approach may be needed.
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