James Fallon

low brain function in certain parts of the frontal and temporal lobes—areas commonly associated with self-control and empathy.

There is no psychiatric diagnosis of psychopath.

The definition for antisocial personality disorder, which Macciardi pointed to, is described as “a pervasive pattern of disregard for and violation of the rights of others that has been occurring in the person since the age of 15 years, as indicated by three (or more) of seven criteria, namely: a failure to conform to social norms; irresponsibility; deceitfulness; indifference to the welfare of others; recklessness; a failure to plan ahead; and irritability and aggressiveness