Psychopaths can't connect emotionally. Researchers have thought that trait may be connected with an outsized drive for reward and an inability to register fearful expressions in others' faces.

有些精神病患者不能正常地与人进行感情交流，科学家认为，这种特点有可能与对回报的渴望过于强烈以及不能够注意到别人脸上忧虑的表情有关。