The phenomenon of decreasing probability of providing assistance to someone in distress when the number of people around increases is known as the bystander effect.
This term was coined by John Darley and Bibb Latané in 1968, based on the results of a series of experiments they conducted. The experiments found that when people are in a group, they are less likely to help someone in need than when they are alone. This effect is believed to occur because individuals in a group are less likely to take responsibility for providing assistance, as they assume that someone else will do something or that someone else is already doing something. Additionally, people in a group are more likely to experience diffusion of responsibility, meaning that they assume the responsibility of helping will be divided among the group. Furthermore, people may be reluctant to help in group settings because they fear being judged by others in the group.
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