Factors that increase the probability of this phenomenon include more people and a perceived sense of emergency.
Experiments demonstrating this phenomenon were reported in "Apathy" by Darley and Latane, and involved scenarios such as a theft from a liquor store, an epileptic seizure, and a room filling with smoke. Factors that increase the probability of this phenomenon include more people and a perceived sense of emergency. Also known by the name of the bar manager who was (*) killed in a famous example of this is, for ten points, what psychological effect, partially stemming from the diffusion of responsibility, which explains why the 38 witnesses of Kitty Genovese's death did nothing?
Experiments demonstrating this phenomenon were reported in "Apathy" by Darley and Latane, and involved scenarios such as a theft from a liquor store, an epileptic seizure, and a room filling with smoke.
{Bystander} effect (accept {Genovese} effect before mentioned)