因为他已经研究了几十个犯罪精神病态者的大脑，他知道应该寻找什么特征。
Because he has studied the brains of dozens of psychopaths, he knew precisely what to look for.
但体现出社会契约或者风险规避的问题则相反，非精神病态者70%的时间都做对了。
For problems cast as social contracts or as questions of risk avoidance, by contrast, non-psychopaths got it right about 70% of the time.
近20年来，这位加州大学欧文分校的神经科学家一直在研究犯罪精神病态者的大脑。
For nearly 20 years, the neuroscientist at the University of California-Irvine has studied the brains of psychopaths.
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