With Halloween only a few days away, now is a good time to post about one of the creepiest stories I have ever heard of. Award-winning neuro-scientist James Fallon, who by all appearances was a normal man (a husband and father with a successful prestigious career and wonderful childhood) starts doing brain scans on cold-blooded killers, and accidentally discovers that his own brain scan has the neurological profile of a psychopath. As a committed believer in behavioral genetics and biological determinism, this terrifying discovery must have inspired a lot of cognitive dissonance. How could such a normal man with no history of violence have such a dangerous brain? He documented this story in the book The PSYCHOPATH INSIDE. I think the moral of the story is that while the social environment can determine behaviors, biology determines the actual traits. So for example biology will determine whether you score high or low on a test of psychopathy or a test of IQ, but social environment will largely determine what you do with those traits.