The Smirking Chimp: "According to a University of Southern California study conducted by Adrian Raine and Yaling Yang and published in the October issue of the British Journal of Psychiatry, a deceitful personality is due to a brain abnormality. Raine and Yang found that pathological liars have 26 percent more white matter and 14 percent less grey matter in their prefrontal cortex than do normal middling fibbers�most of us.
White matter is the portion of the brain that transmits information. An abundance of this tissue facilitates the quick, complex thinking involved in lying. Grey matter, on the other hand, processes information and mediates inhibitions (moral reasoning). An individual with a deficit of this tissue will not be impressed by the moral implications of a lie."
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