Did the Stanford Prison Experiment reveal a genuine, spontaneous psychological effect of institutional roles, or did the guards' abusive behavior result substantially from Philip Zimbardo's own coaching and demand characteristics rather than emerging naturally from the prison situation itself?

Zimbardo's own recordings and instructions to guards, later examined by historian Thibault Le Texier through the Stanford archives, show guards were directly coached toward the study's expected conclusions before the results were interpreted as a spontaneous emergent effect; the original study also had no control condition and was never formally peer reviewed, making it difficult to separate genuine situational influence from guided performance.