QCE Psychology - Unit 4 - Interpersonal processes

Prosocial behaviour and bystander processes

Interpret bystander-intervention evidence and explain how social, personal and cognitive factors shape helping decisions.

Part of the free QCE Psychology notes library for Unit 4: Interpersonal processes.

Updated 2026-08-08 - 4 min read

QCAA official coverage - Psychology 2025 v1.3

Exact syllabus points covered

  1. Interpret the findings of Latané and Darley’s (1969) study of bystander intervention.
  2. Describe social factors that influence prosocial behaviour, with reference to the reciprocity principle and social responsibility.
  3. Describe personal characteristics that influence prosocial behaviour, with reference to empathy, mood, competence and altruism.
  4. Describe social and cognitive factors that influence individual behaviour, including groupthink, diffusion of responsibility, audience inhibition, social influence and cost–benefit analysis.

Helping depends on more than kindness. A person must notice an event, interpret it as requiring help, accept responsibility, decide how to help and act despite costs or social uncertainty.

Bystander decision pathway and barriers

Original Sylligence diagram for psychology bystander decision.

Bystander decision pathway and barriers

The bystander decision sequence

A useful process model asks whether the observer:

  1. notices the event
  2. interprets it as an emergency
  3. accepts personal responsibility
  4. knows or chooses a form of assistance
  5. implements the action

Failure at any stage can stop intervention. Crowds can reduce noticing, create ambiguity, diffuse responsibility or increase fear of judgement.

Latané and Darley (1969)

Bystander research manipulated the perceived presence or response of others and measured helping behaviour or response time. Findings support the bystander effect: under some conditions, people are less likely or slower to help when they believe other bystanders are present.

Interpret the design precisely. Perceived group size is the independent variable only if the procedure manipulates it. Helping rate or latency is the dependent variable. The conclusion applies to the study conditions, not every emergency.

Social influences

The reciprocity principle encourages helping those who have helped us or when future exchange is expected. Social responsibility encourages helping those perceived to depend on us, even without repayment.

Social influence occurs when observers use others' inaction as information that help is unnecessary. Diffusion of responsibility occurs when each person feels less personally responsible because responsibility appears shared. Audience inhibition is reluctance to act because of fear of embarrassment or negative evaluation.

Groupthink can suppress dissent and critical evaluation in cohesive decision-making groups. It is not simply any poor group decision.

Personal and cognitive influences

  • empathy: understanding or sharing another person's state can motivate help
  • mood: positive or negative states can alter attention and motivation
  • competence: perceived ability to help affects action
  • altruism: motivation to benefit another without expected external reward
  • cost–benefit analysis: perceived costs and benefits of helping or not helping shape decisions

These factors interact. High empathy may not produce direct intervention if a person lacks safe competence; calling emergency services may be the more effective prosocial action.

Worked data interpretation

Designing intervention

A practical intervention can target the blocked stage:

  • make the emergency unmistakable
  • address one person directly
  • assign a clear role
  • provide competence training
  • communicate safe options for help

“Someone call for help” leaves responsibility diffuse. “You in the blue jacket, call emergency services” increases personal responsibility and action clarity.

Try it yourself

Common exam traps

  • defining the bystander effect as “groups never help”
  • confusing pluralistic social influence with diffusion of responsibility
  • treating altruism as identical to every prosocial act
  • assuming empathy guarantees effective action
  • reporting percentages without a percentage-point comparison
  • claiming causation from an uncontrolled real-world correlation

Sources

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