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Inside A Psychopath's Brain: The Sentencing Debate : NPR

All psychopaths claim they feel terrible about their crimes for the benefit of the parole board.

“But then you ask them, ‘What do you mean, you feel really bad?’ And Brian will look at you and go, ‘What do you mean, what does it mean?’ They look at you like, ‘Can you give me some help? A hint? Can I call a friend?’ They have no way of really getting at that at all,” Kiehl says.

Kiehl says the reason people like Dugan cannot access their emotions is that their physical brains are different. And he believes he has the brain scans to prove it.

most psychopaths do not differ from normal subjects in the way they rate the photos: Both psychopaths and the average person rank the KKK with a burning cross as a moral violation. But there’s a key difference: Psychopaths’ brains behave differently from that of a nonpsychopathic person. When a normal person sees a morally objectionable photo, his limbic system lights up. This is what Kiehl calls the “emotional circuit,” involving the orbital cortex above the eyes and the amygdala deep in the brain. But Kiehl says when psychopaths like Dugan see the KKK picture, their emotional circuit does not engage in the same way.

the emotional circuit may be what stops a person from breaking into that house or killing that girl. But in psychopaths like Dugan, the brakes don’t work. Kiehl says psychopaths are a little like people with very low IQs who are not fully responsible for their actions. … “What if I told you that a psychopath has an emotional IQ that’s like a 5-year-old?”

yeah, ha, the first thought that came to mind is that after having dated a few unemotional people, I mean they know to say they’re sorry or they’re sad or this or that, you don’t always feel it from them….I know it’s nowhere near the same, but it just triggered that thought.