"Replaying memories while people are awake leaves their memories subject to tinkering. But reactivating memories during sleep protects them from interference, researchers in Germany and Switzerland report online January 23 in Nature Neuroscience.
The finding shows that the brain handles memories differently during sleep than while awake, says Sara Mednick, a cognitive neuroscientist at the University of California, San Diego who was not involved in the research. Armed with this new knowledge, she says, therapists may be able to destabilize traumatic memories and overwrite the bad memories with good ones, then solidify the new memory with a nap.
Brain scans also revealed that different areas of the brain were involved during memory replay depending on whether the volunteers were awake or asleep. While awake, replaying the memory triggered activity mostly in the right lateral prefrontal cortex, a part of the brain involved in memory recall. But during sleep, memory replay was associated with strong activity in the hippocampus and parts of the cortex. The hippocampus is involved in memory formation, and memories are transferred from short-term memory in the hippocampus to long-term memory in the cortex. Reactivating memories during sleep may speed the transfer, Diekelmann says."
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The finding shows that the brain handles memories differently during sleep than while awake, says Sara Mednick, a cognitive neuroscientist at the University of California, San Diego who was not involved in the research. Armed with this new knowledge, she says, therapists may be able to destabilize traumatic memories and overwrite the bad memories with good ones, then solidify the new memory with a nap.
Brain scans also revealed that different areas of the brain were involved during memory replay depending on whether the volunteers were awake or asleep. While awake, replaying the memory triggered activity mostly in the right lateral prefrontal cortex, a part of the brain involved in memory recall. But during sleep, memory replay was associated with strong activity in the hippocampus and parts of the cortex. The hippocampus is involved in memory formation, and memories are transferred from short-term memory in the hippocampus to long-term memory in the cortex. Reactivating memories during sleep may speed the transfer, Diekelmann says."
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