Effects of the type of incident and the number of perpetrators on eyewitness memory.

Investigated 60 undergraduates' accuracy in testimony and identification following either a violent (mugging) or a nonviolent (direction-seeking) videotaped incident in which 1, 3, or 5 perpetrators participated. The relationship between Ss' objective accuracy and their subjective feeling of certainty concerning correctness was also examined. Testimony was less accurate following the witnessing of the violent incident, and the decrease in accuracy was a function of the increase in the number of perpetrators seen, especially under the violent condition. The accuracy of identification was very low, with only 27% of Ss making a correct identification; chance performance was observed with 5 perpetrators. A positive accuracy–confidence relationship held for identification under the nonviolent condition but not under the violent condition. (25 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)