In a new article in the journal Memory, entitled “The Robustness of False Memory for Emotional Pictures,” Bessette-Symons shows that while under certain circumstances emotion can improve memory, it also makes it less reliable.
“Emotion doesn’t necessarily make us better at remembering,” says Bessette-Symons. “It sometimes makes us worse.”
Her conclusions are drawn from a series of nine experiments conducted over the course of several years, in which student volunteers were shown a series of pictures meant to evoke positive or negative emotions, or none at all. They were then shown those pictures, plus some that weren’t in the original group, and asked to recognize which they had previously seen. This was done after two delay intervals — either 10 minutes or a week — to assess differences in short and long-term memory.
In the long term, participants were more likely to correctly identify the original negative emotion-inducing pictures than the neutral ones, while in the short term they were not. But in both, participants were more likely to falsely identify new negative pictures as originals.
“False memory is the most robust effect of emotion,” Bessette-Symons says.
These results have important practical implications for things like the reliability of eyewitness testimony and police lineups.
“If you give an assault victim a ‘null lineup,’ meaning the perpetrator is not in the lineup, they would, because of the emotionality of the crime, be more likely to falsely identify someone,” said Bessette-Symons.
Psychologists have demonstrated the unreliability of memories associated with emotions before, but Bessette-Symons is the first to explore how the effect of relatedness between pictures might influence emotional memory differences. For example, if someone is shown photos of a lion, a cheetah and a panther — all big cats — they’re more likely to falsely remember seeing a photo of a tiger if later asked. It is then possible that the relationship between the pictures, not their emotional content, is responsible for the false memories. But Bessette-Symons discovered that this is not the case.
“What I found is that the emotional pictures were more related to each other, but that alone couldn’t explain all the results that I reported,” says Bessette-Symons.
People Problem?
An interesting wrinkle that Bessette-Symons found in a subsequent analysis has led her to a new line of inquiry. In her experiments, false memories were only elicited by pictures of people, not pictures of objects.
Bessette-Symons speculates this could be a result of people empathizing with pictures of people in a way they cannot with objects. “It could be that this bias component to emotion may only extend to social things, and the reason it only extends to social pictures is because it may be driven by an empathetic component of emotion,” she said.
The original experiments used more photos of people than objects, so Bessette-Symons is now designing experiments that include an equal number of each in order to discern whether false memories are only prompted by pictures of people.
She says that some psychology labs tend not to find a false memory effect tied to emotion, which could be because they tend to use pictures of objects, not people.
