From the University of Southern California press release:
While previous research has shown that there is heightened activity in the prefrontal cortex the area of the brain that enables most people to feel remorse or learn moral behavior when normal people lie, this is the first study to provide evidence of structural differences in that area among pathological liars.
The research led by Yaling Yang and Adrian Raine, both of the USC College of Letters, Arts and Sciences is published in the October issue of the British Journal of Psychiatry.