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Darley and Latané Simulated Emergency Experiment

To test the bystander effect hypothesis, Darley and Latané created a simulated emergency in a laboratory. University students isolated in small rooms believed they were participating in an intercom discussion when one 'student' (a pre-recorded voice) appeared to have an epileptic seizure. The researchers manipulated the perceived number of witnesses. The results demonstrated that as the number of perceived witnesses increased, the percentage of participants who left the room to seek help dropped significantly from 85% to 62% to 31%.

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Updated 2026-05-04

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Research Methods in Psychology - 4th American Edition @ KPU