Diffusion of responsibility in crime, punishment, and other adversity.

Abstract

Three studies tested the hypothesis that an individual acting alone, compared with an individual group member, would be held more responsible for behavior leading to a negative consequence. In one study, 240 subjects read scenarios of an event with a negative outcome involving one, two, three, or four individuals. As predicted, there was a significant inverse relationship between the number of participants and the degree of attributed responsibility. The second study investigated subjects' attributions of responsibility for criminals committing a crime alone or with a partner. Single perpetrators were considered more responsible than those acting with a partner, although there was no difference in sentence length assigned. In the third, archival-type study, prison sentences for criminals who had actually committed a robbery alone or with others were examined. Again, there was diffusion of responsibility: criminals acting alone received significantly longer sentences than perpetrators who had committed a similar crime, but who had acted with others.