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Psychopaths Can't See Your Fear

From the latest issue of Scientific American Mind:  

Marsh relayed a chilling anecdote about a colleague of hers, University College London psychologist Essi Viding, who was going through a task with a psychopathic murderer in which a series of faces with different emotional expressions were laid out before the woman. When the murderer saw the picture of the fearful face, she scratched her head and said: “I don’t know what that expression is called, but I know it’s what people look like right before I stab them.”

 "The problem with psychopaths: a fearful face doesn't deter them."