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📘 A basement corridor becomes a mock county jail

August 1971: part of Stanford’s psychology building became a simulated prison for screened college volunteers randomly cast as guards or prisoners.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. The study turns prison roles into a controlled simulationExplain the 1971 simulated-prison setting, screening, random assignment, sample limits, and the distinction between a mock prison and a real prison.The study created a vivid, bounded simulation to examine assigned roles, but its volunteers and artificial setting limit generalization.
  2. The published evidence is dramatic but not a clean causal testDistinguish the situational claim from demand characteristics, leadership, performance, selection, early termination, and missing comparisons.The reported escalation is important evidence about one interaction, not a clean test showing that roles alone caused cruelty.
  3. Later evidence changed how the experiment should be taughtUse recruitment research, archival criticism, participant accounts, and the BBC Prison Study to formulate a conditional interpretation.Later evidence does not require denying the events; it requires narrowing the claim and asking how leadership, expectations, selection, identity, and institutions interacted.

Questions this course answers

What was the main purpose of randomly assigning participants to guard and prisoner roles?

Random assignment can balance preexisting differences across roles, but it does not remove selection bias, demand cues, researcher influence, or the limits of a small sample.

Match each possible explanation to the evidence it would require.

The experiment's conduct can be interpreted through several mechanisms, so each mechanism needs evidence rather than a single dramatic anecdote.

Why did Zimbardo's superintendent role create a methodological and ethical problem?

A researcher embedded in the institution can change the behavior under observation and may face pressure to preserve the study rather than act solely as a safety monitor.

Order the most careful reasoning from a famous result to a defensible conclusion.

Good interpretation narrows a claim after checking design, alternative mechanisms, historical records, and comparison cases.

What is the most defensible overall conclusion?

The evidence supports attention to institutional power while leaving room for leadership, identity, expectations, selection, resistance, and researcher influence.

Grounded in trusted sources

  • Haney, Banks, and Zimbardo, Interpersonal Dynamics in a Simulated Prison (1973): https://www.ojp.gov/ncjrs/virtual-library/abstracts/interpersonal-dynamics-simulated-prison-0
  • Carnahan and McFarland, Revisiting the Stanford Prison Experiment: Could Participant Self-Selection Have Led to the Cruelty? (2007): https://journals.sagepub.com/doi/10.1177/0146167206292689
  • Le Texier, Debunking the Stanford Prison Experiment (2019): https://doi.org/10.1037/amp0000401
  • Haslam and Reicher, Rethinking the psychology of tyranny: The BBC Prison Study (2006): https://bpspsychub.onlinelibrary.wiley.com/doi/10.1348/014466605X48998
  • Stanford Prison Experiment archive, participant photographs and contemporary study materials: https://www.prisonexp.org/gallery

Every Wunder lesson is built from real, reputable sources — never invented.

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