"Scott Rauch, a neuroscientist at Massachusetts General Hospital, has identified a set of brain circuits that are out of whack in PTSD. That part of the brain that usually keeps our emotions in check, the anterior cingulate area, can no longer regulate the part of the brain that stores the memories and feelings associated with the trauma."
This is from a short and otherwise useless
article, but it was a cool enough factoid to merit recording.