这个术语听起来有点自相矛盾，但正因为有利他惩罚，社会规范才得以巩固。
While it sounds like an oxymoron, altruistic punishment is basically how social norms get enforced.
然而许多进化心理学家相信，如果利他惩罚现象不存在，人类合作也不可能产生。
Many evolutionary psychologists believe, however, that without altruistic punishment, cooperation could not have evolved.
低血清素含量与不理智的冲动行为相关，所以降低血清素水平能确定自我控制和利他惩罚行为同样受血清素水平影响。
Low levels of serotonin have been linked with impulsive and irrational behavior, so reducing it could help determine whether self-control and altruistic punishment are affected by it in the same way.
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