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This research examined whether confirming postidentification feedback following a mistaken identification impairs eyewitness memory for the original culprit. We also examined whether the degree of similarity between a mistakenly identified individual and the actual culprit plays a role in memory impairment. Participant-witnesses (N= 145) made mistaken identifications from a “similar” or a “dissimilar” culprit-absent photo lineup. The similar lineup contained individuals who were similar in appearance to the actual culprit and the dissimilar lineup contained individuals who were dissimilar in appearance to the actual culprit. After their identifications, witnesses were given confirming feedback (“Good job! You identified the suspect.”) or no feedback. The experimenter then feigned having accidentally given the witnesses the wrong photo lineup. After telling witnesses to disregard whatever they saw in the first lineup, the …