By exposing people to a fear memory over and over again while they slept, scientists reduced fear during sleep.
This is the first time that emotional memory has been manipulated in humans during sleep.
“It’s a novel finding,” said Katherina Hauner, of Northwestern University Feinberg School of Medicine. “We showed a small but significant decrease in fear. If it can be extended to pre-existing fear, the bigger picture is that, perhaps, the treatment of phobias can be enhanced during sleep.”
Previous projects have shown that spatial learning and motor sequence learning can be enhanced during sleep. It wasn’t previously known that emotions could be manipulated during sleep, Northwestern researchers said.
The Smell of Fear
In the study, fifteen healthy subjects received mild electric while seeing two different faces. They also smelled a particular odor while viewing each face and being shocked, so the face and the odorant both were associated with fear.
Subjects received different odorants to smell with each face such as woody, clove, new sneaker, lemon or mint.
When a subject was asleep, one of the two odors was re-presented, but in the absence of the associated faces and shocks. This occurred during slow wave sleep when memory consolidation is thought to occur.
Sleep is very important for strengthening new memories, noted Hauner.
“While this particular odorant was being presented during sleep, it was reactivating the memory of that face over and over again which is similar to the process of fear extinction during exposure therapy,” Hauner said.
When the subjects woke up, they were exposed to both faces. When they saw the face linked to the smell they had been exposed to during sleep, their fear reactions were lower than their fear reactions to the other face.
Fear was measured in two ways: through small amounts of sweat in the skin, as in a lie detector test, and through neuro-imaging with fMRI (functional magnetic resonance imaging).
The fMRI results showed changes in regions associated with memory, such as the hippocampus, and changes in patterns of brain activity in regions associated with emotion, such as the amygdala.
These brain changes reflected a decrease in reactivity that was specific to the targeted face image associated with the odorant presented during sleep.