The neuroscientist who discovered he was a psychopath.“Why has Fallon been able to temper his behavior, while other people with similar genetics and brain turn violent and end up in prison? … ‘I was loved, and that protected me,’ he says. … Of course, there’s also a third ingredient, in addition to genetics and environment: free will. ‘Since finding all this out and looking into it, I’ve made an effort to try to change my behavior,’ Fallon says.”