Unringing the bell: Successful debriefing following a rich false memory study

In rich false memory studies, familial informants often provide information to support researchers in planting vivid memories of events that never occurred. The goal of the current study was to assess how effectively we can retract these false memories via debriefing – i.e. to what extent can we put participants back to the way we found them? This is essential to investigate, for both ethical and theoretical reasons. Participants (n = 123) completed a false memory implantation protocol as part of a replication of the “Lost in the Mall” study (Loftus and Pickrell, 1995). By the end of the protocol, 14% of participants self-reported a memory for the fabricated event, and a further 52% believed it had happened. Participants were then fully debriefed, and memory and belief for the false event were assessed again. In a follow-up assessment three days post-debriefing, the false memory rate had dropped to 6% and false belief rates also fell precipitously to 7%. Moreover, virtually all persistent false memories were found to be non-believed memories, where participants no longer accepted that the fabricated event had occurred. Richer, more detailed memories were more resistant to correction, but were still mostly retracted. This study provides evidence that participants can be “dehoaxed” and even very convincing false memories can be retracted.