Noted: If you catch someone lying effortlessly and without flinching, be very alarmed. Psychopaths can pass polygraph tests because they don’t experience telltale reactions like an elevated heart rate when they lie. A University of Wisconsin-Madison study revealed that “psychopaths have reduced connections… between the part of the brain responsible for sentiments such as empathy and guilt, and the amygdala, which mediates fear and anxiety.” Study author Michael Koenigs, an assistant professor of psychiatry, says the study demonstrates “both structural and functional differences in the brains of people diagnosed with psychopathy.”
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