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Talking about something as simple as heart rate. regardless of what's happening in the brain and the heart rate, what have you found? >> what many researchers are finding is low resting heart rate is one of the best replicated correlates of aggressive, violent behavior. not just in adults bus in children. >> in part of the studies you took somebody, put them in a condition, like a loud noise or something and tried to figure out does their heart rate go up as you expect? if it didn't, that was a flag. >> absolutely. >> we put 1800 3-year-old children into this experiment. we measured fear condi...

Psychopathy and it's also found in boxers. during fetal development as the regions begin to expand and develop they compressor fuse the two leaflets together. for some people the gap never closes. that gives rise to a lack of fear and a psychopathic type personality who could go and ll a number of people and not have any sense of shame or remorse or guilt about doing that. another seat of fear in the brain is this almond shaped stcture called the amygdala. this is the brain of a psychopath and according to his studies the blue areas shrink in psychopaths and it makes the area dramatically smal...