Altering traumatic memory

Abstract

Can you experimentally contaminate memory for truly traumatic events? We investigated this question in a study in which 80 Russian participants reported on their memories for one of two terrorist bombings. Half the participants recalled the 1999 attacks on Moscow apartment buildings while the others recalled the 2001 attacks on the World Trade Center in New York. Participants recalled the events on two separate occasions over a six month period. Just prior to the second recall, we strongly suggested to all participants that they had seen a wounded animal in the attacks and had mentioned it in their original memory reports. While none of the WTC group were convinced by the suggestion, 12.5% of the Moscow group did so, and even elaborated with sensory detail (e.g., a bleeding cat lying in the dust). This group was more susceptible to contamination despite the greater emotion that they experienced about the Moscow terrorist attacks. These findings support the notion that even traumatic memories are experimentally malleable.