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Psychological Phenomena

Bystander Effect

Social Biases and Group Effects

The bystander effect is the tendency for an individual to be less likely to help a victim or intervene in an emergency when other people are present, because responsibility for acting is diffused among the observers rather than felt by any one bystander alone. The phenomenon was first studied experimentally by social psychologists John Darley and Bibb Latane, prompted by the widely reported 1964 murder of Kitty Genovese in New York City, whose neighbors were said to have failed to intervene or call for help. It is distinct from diffusion of responsibility, the explanatory theory for why the effect occurs, and from the individual laboratory experiments that first tested and measured it. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts
Core Claim
The more bystanders present at an emergency, the less likely, and the slower, any individual bystander is to help. 1
First Described Year
1968 1
Classification
Type of Phenomenon
Social or Interpersonal Phenomenon 1
Connections

Associated With

The founding experimental study that first tested the effect.

Diffusion of responsibility is the explanatory theory for why the bystander effect occurs.

John Darley, Psychologists

Co-originated the effect with Bibb Latane.

In Branch

Sources
1. Wikipedia: Bystander Effect
Wikimedia Foundation
  • Lead section
    individuals are less likely to offer help to a victim in the presence of other people
  • Social psychology research section
    The bystander effect was first demonstrated and popularized in the laboratory by social psychologists John M. Darley and Bibb Latané in 1968 after they became interested in the topic following the murder of Kitty Genovese in 1964.
  • lead section, phenomenon-kind classification
    The bystander effect (also called bystander apathy or the Genovese effect) is a social psychological theory that states that individuals are less likely to offer help to a victim in the presence of other people.
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