Latest research from Joshua W Buckholtz et al. points to that the brain’s reward system concerning psychopaths is quite different from the rest of us. According to him, they found that “a hyper-reactive dopamine reward system may be the foundation for some of the most problematic behaviors associated with psychopathy, such as violent crime, recidivism and substance abuse.” For more info;
Mesolimbic dopamine reward system hypersensitivity in individuals with psychopathic traits. By; Joshua W Buckholtz, Michael T Treadway, Ronald L Cowan, Neil D Woodward, Stephen D Benning, Rui Li, M Sib Ansari, Ronald M Baldwin, Ashley N Schwartzman, Evan S Shelby, Clarence E Smith, David Cole, Robert M Kessler & David H Zald. Nature, Neuroscience, 2010 (14 March 2010) Here
A write-up by Science Daily, Psychopaths’ Brains Wired to Seek Rewards, No Matter the Consequences (Mar. 15, 2010) Here
A post by Dr. Simon on the topic, Having to Win: The Combative Thinking of the Here
More research of interest from 2010, has been added to my original site, Here once on the desired page, scroll down past the text (in Swedish) to reach the latest research.
psychopathy101 
[…] Bullies may enjoy seeing others in pain: Brain scans show disruption in natural empathetic response. University of Chicago (November 7, 2008) Here (The word “may” should be taken lightly as they do enjoy it, the smirk on their face says it all) and it is all about “winning”, see earlier post, Must “win”, no matter the cost Here […]