Group inhibition of bystander intervention in emergencies.

@article{Latane1968GroupIO,
  title={Group inhibition of bystander intervention in emergencies.},
  author={Bibb Latane and John M. Darley},
  journal={Journal of personality and social psychology},
  year={1968},
  volume={10 3},
  pages={215-21}
}
Male undergraduates found themselves in a smoke-filling room either alone, with 2 nonreacting others, or in groups of 3. As predicted, Ss were less likely to report the smoke when in the presence of passive others (10%) or in groups of 3 (38% of groups) than when alone (75%). This result seemed to have been mediated by the way 5s interpreted the ambiguous situation; seeing other people remain passive led Ss to decide the smoke was not dangerous. 
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