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.
低血清素含量与不理智的沖动行为相关,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。