Influence: The Psychology of Persuasion · chapter 4 · id influence-c4-02-the-bystander-effect----as-dem
“The bystander effect -- as demonstrated by the Kitty Genovese case where 38 witnesses allegedly watched a murder without calling police -- illustrates pluralistic ignorance, a failure mode of social proof.”
CONTESTEDconfidence: high⚠ extracted by pipeline, re-audit pending
Receipts
Darley & Latane (1968), Bystander Intervention in Emergencies, JPSP 8(4)DOI registry: valid
In the original bystander experiments, 85% of participants responded when alone but only 31% when they believed others were present. The effect is robust and has been replicated extensively.
Manning, Levine & Collins (2007), The Kitty Genovese Murder and the Social Psychology of Helping, American Psychologist 62(6)DOI registry: valid
The '38 witnesses' narrative is largely fabricated. The original NYT article by Gansberg contained significant inaccuracies. Many supposed witnesses were not witnesses at all, and several did call police or intervene.
Fischer et al. (2011), The Bystander-Effect Meta-Analysis, Psychological Bulletin 137(4)DOI registry: valid
Meta-analysis of 105 bystander effect studies confirmed the effect is robust (d = 0.35 for helping) but found it reverses in dangerous situations -- more bystanders actually INCREASE helping when danger is clear.
This claim is a stable, citable object. If you can falsify a verdict, tell us. Corrections are loud here.