Interviewing witnesses: forced confabulation and confirmatory feedback increase false memories.

In two experiments, adults who witnessed a videotaped event subsequently engaged in face-to-face interviews during which they were forced to confabulate information about the events they had seen. The interviewer selectively reinforced some of the participants' confabulated responses by providing confirmatory feedback (e.g., "Yes, ______ is the correct answer") and provided neutral (uninformative) feedback for the remaining confabulated responses (e.g., "O.K_____". One week later participants developed false memories for the events they had earlier confabulated knowingly. However confirmatory feedback increased false memory for forcibly confabulated events, increased confidence in those false memories, and increased the likelihood that participants wouldfreely report the confabulated events 1 to 2 months later The results illustrate the powerful role of social-motivational factors in promoting the development offalse memories.