The failure to offer help to someone observed to be in need is referred to as:

Question

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The bystander intervention effect refers to the phenomenon where individuals are less likely to offer help in an emergency situation when other people are present. This can lead to a diffusion of responsibility, where each bystander assumes someone else will take action, ultimately resulting in no one offering assistance. Altruism, aggressive response, and the frustration-aggression hypothesis do not directly relate to this phenomenon.

The Failure to Offer Help to Someone Observed to Be