Aha, here we are, one of the articles about kids. A really good (and quite long) read:
Currently, there is no standard test for psychopathy in children, but a growing number of psychologists believe that psychopathy, like autism, is a distinct neurological condition one that can be identified in children as young as 5. Crucial to this diagnosis are callous-unemotional traits, which most researchers now believe distinguish fledgling psychopaths from children with ordinary conduct disorder, who are also impulsive and hard to control and exhibit hostile or violent behavior. According to some studies, roughly one-third of children with severe behavioral problems like the aggressive disobedience that Michael displays also test above normal on callous-unemotional traits. (Narcissism and impulsivity, which are part of the adult diagnostic criteria, are difficult to apply to children, who are narcissistic and impulsive by nature.)
-- and addressing the issue of treatment:
Most researchers who study callous-unemotional children, however, remain optimistic that the right treatment could not only change behavior but also teach a kind of intellectual morality, one that isnt merely a smokescreen. If a person doesnt have the hardware to do emotion processing, you wont be able to teach it, Donald Lynam observes. It may be like diabetes: youre never really going to cure it. But if your idea of success is that these kids arent as likely to become violent and end up in jail, then I think treatment could work.
Frick is willing to go further. If treatment is begun early enough, he says, it may be possible to rewire the brain so that even C.U. children might develop greater empathy, through therapies that teach everything from identifying emotions (C.U. children tend to have difficulty recognizing fear in others) to basics of the Golden Rule. No one has yet tested such treatments in C.U. children, but Frick notes that one early study indicated that warm, affectionate parenting seems to reduce callousness in C.U. kids over time even in children who initially resist such closeness.
http://www.nytimes.com/2012/05/13/m...ar-old-a-psychopath.html?_r=2&pagewanted=all&