Adaptive foundations of group-bounded behavior

我们通过一系列最小群体实验证明，诱导个体倾向于自己群体成员的最接近的心理机制是声誉心理学，包括对自己在自己群体中的声誉的敏感性。通过实证证明这种声誉心理的运作，本研究的发现有力地支持了间接互惠原则作为人类社会中普遍存在的群体内偏好行为的进化基础，而不是群体选择原则。

We have demonstrated through a series of minimal group experiments that the proximate psychological mechanism to induce individuals to favor members of their own group is in reputation psychology including sensitivity to his or her reputation within his or her own group. By empirically demonstrating the operation of this reputation psychology, the findings in this study provide a strong support to the indirect reciprocity principle, as compared to group-selection principle, as the evolutionary foundation of the in-group favoring behavior commonly observed in human society.