Is altruism the intuitive behavior in a moral dilemma? Or is selfishness the spontaneous behavior? To answer this question, a dictator game was played in which measures of response time and heart rates were taken with treatments that slightly differ only in the cost associated with the choice of a selfish responding. We find that neither altruism nor egoism is an intuitive process for everyone; rather, altruism is intuitive for altruistic subjects while egoism is intuitive for selfish subjects so that when these subjects are confronted with the choice of the opposite, less probable options, they become more reflective by taking longer time to respond. Lastly, during the decision period, a subject that is altruistic has a higher probability of experiencing an increase in the mean heart rate than a subject that is selfish.

中文翻译：

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道德困境中的反应时间和心率。

利他主义是道德困境中的直觉行为吗？还是自私是自发的行为？为了回答这个问题，玩了一个独裁者游戏，其中测量响应时间和心率的治疗方法仅在与选择自私响应相关的成本上略有不同。我们发现利他主义和利己主义都不是每个人的直觉过程；相反，利他主义对利他的主体是直觉的，而利己主义对自私的主体是直觉的，因此当这些主体面临相反的、不太可能的选择时，他们会通过更长的时间做出反应而变得更加反思。最后，在决策期间，利他的受试者比自私的受试者经历平均心率增加的可能性更高。