http://goo.gl/K2uvQK
While some in the research sample did fit the classic definition of psychopathy, a significant subgroup did not, said Tim Stickle, professor of Psychology at the University of Vermont, who co-authored the paper with Andrew Gill, a graduate student at the university.
"They appear callous and unemotional to others but are actually very distressed, have high levels of anxiety, higher levels of depression, higher levels of emotion," he said. "We think of these harmful, antisocial, aggressive kids as being immune to fear, immune to negative feelings, but in fact we're showing a whole group of them are not only not immune, but are very susceptible."