People are less likely to give aid if an emergency occurs in the presence of many observers. This is known as

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Quizplus · Accepted Answer

The phenomenon described in the question is known as the bystander effect, where individuals are less likely to offer help in an emergency situation if there are many other people around. Group polarization involves individuals taking more extreme positions after discussing an issue within a group, social loafing refers to the tendency for individuals to exert less effort in a group than when working alone, and the mere exposure effect refers to a phenomenon where repeated exposure to a stimulus makes individuals develop a preference for it.

People Are Less Likely to Give Aid If an Emergency