Adrian Raine

“Genetics, accidents of birth or events in early childhood have left criminals' brains and bodies with measurable flaws predisposing them to committing assault, murder and other antisocial acts. ....

Many offenders also have impairments in their autonomic nervous system, the system responsible for the edgy, nervous feeling that can come with emotional arousal. This leads to a fearless, risk-taking personality, perhaps to compensate for chronic under-arousal.

Many convicted criminals, like the Unabomber, have slow heartbeats.

It also gives them lower heart rates, which explains why heart rate is such a good predictor of criminal tendencies. The Unabomber, Ted Kaczynski, for example, had a resting heart rate of just 54 beats per minute, which put him in the bottom 3 per cent of the population.”
― Adrian Raine

“Spouse-abusers have a reactive aggressive personality that makes them more likely to lash out when provoked. Emotional words inordinately grab their attention. They are less able to inhibit the distracting emotional characteristics of stimuli, resulting in impaired cognitive performance. When presented with aggressive stimuli their brains overrespond at an emotional level and underrespond at a cognitive control level. Spouse-abusers are constitutionally different from other men.”
― Adrian Raine, The Anatomy of Violence: The Biological Roots of Crime