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The Stanford Prison Experiment

Core Study Overview

The Context

Haney, Banks, and Zimbardo’s 1973 Stanford Prison Experiment is a landmark psychological study examining how social roles and situational factors influence behaviour, specifically focusing on obedience, conformity, and deindividuation.

The Investigation Aim

The central hypothesis revolved around the impact of assigned roles on behavior and social dynamics.

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AIM

The aim was to investigate how ordinary people respond to the roles of prisoner and guard in a simulated prison environment, and how these roles affect behaviour, attitudes, and social dynamics.

Experimental Procedure

The experiment employed several tactics to maximize ecological validity, starting with rigorous screening and realistic setup.

1

Setup

Conducted at Stanford University psychology building. A mock prison was set up in the basement.
2

Participants

Male student volunteers screened for psychological stability were randomly assigned to either “prisoner” or “guard” roles.
3

Induction

Prisoners were arrested at their homes to add realism.
4

Uniforms

Prisoners wore smocks with ID numbers; guards wore uniforms, sunglasses, and carried whistles and batons.
5

Duration/Observation

The study was planned to last two weeks but terminated after six days due to extreme behaviour. Researchers observed and recorded behaviours, interactions, stress levels, power dynamics, and rule enforcement.

Key Results and Conclusions

The observed behaviours demonstrated rapid adoption of situational roles, overwhelming individual personality traits.

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Guard Behavior

Guards quickly adopted authoritarian and abusive behaviours, using psychological torture and humiliation techniques.
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Prisoner Behavior

Prisoners became passive, depressed, and showed emotional breakdowns, some even wanting to leave.
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Deindividuation

Demonstrations of deindividuation: Guards wore sunglasses to hide expressions; prisoners forgot personal identities, responding only as their assigned numbers.
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Situational Power

The study demonstrated the powerful effect of situational pressures and social roles on human conduct. It highlighted how ordinary individuals could engage in cruelty within certain contexts.

Evaluation: Strengths vs Weaknesses

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Strengths
  • High ecological validity in the sense of simulating real prison conditions.
  • In-depth qualitative data, including interviews and observations.
  • Raised ethical awareness about the impact of authority and institutional settings.
  • Demonstrated the extreme power of social roles and obedience to authority.
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Weaknesses
  • Severe ethical concerns: participants suffered emotional and psychological harm.
  • Lack of informed consent regarding the potential risks.
  • Possible demand characteristics: participants might have acted as they thought researchers wanted.
  • Limited generalizability: volunteers were all male college students, not representative of the general population.
  • The study was highly criticized for methodological flaws and researcher bias.

Lasting Impact

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Significance: Despite problems, this experiment profoundly influenced social psychology’s views on authority, conformity, and the power of situations.

Stanford Prison Experiment Deck
Question
Main Aim

What was the main aim of the Stanford Prison Experiment?

Answer
Aim

To investigate how people respond to assigned roles of prisoner and guard in a simulated prison and how these roles influence behaviour.

Question
Researchers

Who conducted the Stanford Prison Experiment?

Answer
Researchers

Philip Zimbardo, Craig Haney, and Curtis Banks in 1973.

Question
Planned Duration

How long was the experiment originally planned to last?

Answer
Planned Duration

Two weeks.

Question
Actual Duration

How long did the experiment actually last?

Answer
Actual Duration

Six days.

Question
Role Assignment

How were participants assigned their roles?

Answer
Role Assignment

Randomly assigned as either prisoners or guards.

Question
Guard Behaviour

What behaviours did guards exhibit?

Answer
Behaviour

Authoritarian, abusive, using psychological torture and humiliation.

Question
Prisoner Behaviour

What behaviours did prisoners exhibit?

Answer
Behaviour

Passive, depressed, emotional breakdowns, some wanting to leave.

Question
Deindividuation

What does the term "deindividuation" mean in the context of this experiment?

Answer
Deindividuation

Loss of personal identity, with guards hiding faces behind sunglasses and prisoners responding only to numbers.

Question
Ethical Issues

What ethical issues did the experiment raise?

Answer
Ethics

Psychological harm, lack of informed consent about risks, and potential researcher bias.

Question
Significance

Why is the experiment significant in social psychology?

Answer
Significance

It showed how situational forces and social roles can overpower individual personality traits.

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🧠 Stanford Prison Experiment Quiz

1. What was the main reason the Stanford Prison Experiment was ended early?

The experiment was stopped after six days due to guards’ abusive actions and prisoners’ severe stress reactions.

2. What psychological concept explains guards wearing sunglasses to hide their expressions?

Deindividuation involves losing self-awareness and personal identity, often leading to more extreme behaviour.

3. Participants were aware of all the risks involved before the start of the experiment. (True or False)

The informed consent process did not fully explain the potential psychological harm.

4. Which factor had the strongest influence on participant behaviour in the experiment?

The findings stressed the power of situational factors over personalities in shaping behaviour.

5. Name two ethical criticisms of the Stanford Prison Experiment.

Psychological harm to participants and inadequate informed consent.

📊 Results

  • Notes and Quiz
  • Psychology
  • GCSE
  • Perception
  • EDEXCEL