psychology - factors affecting bystander intervention

diffusion of responsibility

when we believe others will help so we do not have to

noticing the event

when we notice and pay attention to our surroundings less in large crowds

pluralistic ignorance

when we interpret the situation according to others reactions

cost of helping

when we choose not to help because there is too high of a cost as it risks harm to ourselves

competence

when we help or not depending on how competent we feel enough

mood

when we are more likely to intervene and help another if we are in a good mood

similarity

when we are more likely to help when we perceive ourselves as similar to a person in need