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You observed the brain scan of a 1998 subject involved in multiple murders. you found some interesting thing. >> i have been looking at the brain for 30 years. we have done 100 murderers, a thousand convicted felons. one of the most damaged brains that i had ever seen, he murdered his parents and then went to the school and killed students. there are brain health issues that steal people's minds. if your brain is not right, your behavior is notoriety. dan: you talk about the frontal cortex and how there was damage to this murderer's brain in the

Frontal cortex. does that create an impulse control problem. where violent impulses that might be suppressed by that cortex, it just fails and they act out violently? >> the prefrontal cortex is the part of your brain that watches you. it helps you, stops you from saying and doing stupid things. it's also involved in empathy and impulse control. when it's damaged, a person's empathy is often low and they often don't think about the long-term consequences. but this shooter like many others was probably also suicidal. so their emotional brain was probably working way too hard. you often see that...

You observed the brain scan of a 1998 subject involved in multiple murders. you found some interesting thing. >> i have been looking at the brain for 30 years. we have done 100 murderers, a thousand convicted felons. one of the most damaged brains that i had ever seen, he murdered his parents and then went to the school and killed students. there are brain health issues that steal people's minds. if your brain is not right, your behavior is notoriety. dan: you talk about the frontal cortex and how there was damage to this murderer's brain in the

Frontal cortex. does that create an impulse control problem. where violent impulses that might be suppressed by that cortex, it just fails and they act out violently? >> the prefrontal cortex is the part of your brain that watches you. it helps you, stops you from saying and doing stupid things. it's also involved in empathy and impulse control. when it's damaged, a person's empathy is often low and they often don't think about the long-term consequences. but this shooter like many others was probably also suicidal. so their emotional brain was probably working way too hard. you often see that...

Frontal cortex. does that create an impulse control problem. where violent impulses that might be suppressed by that cortex, it just fails and they act out violently? >> the prefrontal cortex is the part of your brain that watches you. it helps you, stops you from saying and doing stupid things. it's also involved in empathy and impulse control. when it's damaged, a person's empathy is often low and they often don't think about the long-term consequences. but this shooter like many others was probably also suicidal. so their emotional brain was probably working way too hard. you often see that...