But psychopaths, Ohira and Osumi discovered, play the game rather differently. Not only do they show greater willingness to accept unfair offers, favoring simple economic utility over the exigencies of punishment and ego preservation, they are much less bothered by inequity. On measures of electrodermal activity (a reliable index of stress based on the autonomic response of our sweat glands), the difference between psychopaths and other volunteers was telling, to say the least. Psychopaths were far less fazed than controls when screwed by their opposite numbers—and at the conclusion of the
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