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Psychology

The Bystander Effect and Diffusion of Responsibility in Emergencies

Quick fact

In one famous experiment, 85% of people who thought they were the sole witness to a medical emergency intervened, but if they believed others were also present, the helping rate dropped to 31%.

Why this is interesting

Imagine you collapse on a busy street. Would more witnesses mean more help—or less? A chilling psychological phenomenon called the bystander effect says the opposite.