The event that is thought to have motivated social psychologists to begin studying helping behavior and other forms of prosocial behavior was:

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The murder of Kitty Genovese in 1964, which was initially reported as witnessed by 38 people who did not intervene or call for help, is thought to have motivated social psychologists to begin studying helping behavior and other forms of prosocial behavior. This event led to the development of the bystander effect theory, which suggests that people are less likely to intervene in emergencies when others are present.

The Event That Is Thought to Have Motivated Social Psychologists