Scans offer insights into why PTSD memories are vivid and intrusive.
At the root of post-traumatic stress disorder, or PTSD, is a memory that cannot be controlled. It may intrude on everyday, activity, thrusting a person into the middle of a horrifying event, or surface as night terrors or flashbacks.
Decades of treatment of military veterans and sexual assault survivors have left little doubt that traumatic memories function differently from other memories. A group of researchers at Yale and at the Icahn School of Medicine at Mount Sinai, in New York, set out to find empirical evidence of those differences.
The team conducted brain scans of 28 people with PTSD while they listened to recorded narrations of their own memories. Some of the recorded memories were neutral, some were ‘simply “sad,” and some were traumatic.
The brain scans found clear differences, the researchers reported in a paper published last week in the journal Nature Neuroscience. The people listening to the sad memories, which often involved the death of a family member, showed consistently high engagement of the hippocampus, part of the brain that organizes and contextualizes memories,
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