Peng Ming, Cai Honghui, Shi Yuanyuan, Liu Sisi, Cai Mengfei, Li Xu, Wang Yiwen
Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China; School of Psychology, Central China Normal University, Wuhan, China; Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China.
School of Psychology, Central China Normal University, Wuhan, China.
Int J Psychophysiol. 2025 Feb;208:112505. doi: 10.1016/j.ijpsycho.2025.112505. Epub 2025 Jan 5.
Cooperation and competition in social interaction are important to social development. There are many studies examining the neural mechanism underlying these behaviors; however, little is known about the potential role of payoff norms in social interactions. This study introduced two distinct payoff norms: zero-sum (ZS) and non-zero-sum (NZS). In the ZS group, only the player with the highest total score would receive a reward; while in the NZS group, rewards were determined by the combined total score of both players, and individual rewards were prorated according to each player's contribution to the total score. Electroencephalography was used to examine individuals' neural responses during the Chicken Game in these different groups. The behavioral findings revealed a higher rate of cooperation in the NZS group compared to the ZS group. Aggressive behaviors from opponents elicited larger feedback-related negativity (FRN) and lower P300 amplitudes in both groups. Notably, larger FRN and smaller P300 amplitudes were elicited by participants' aggressive behaviors compared to their cooperative behaviors in the ZS group, whereas larger P300 amplitudes were elicited by aggressive behaviors compared to cooperative behaviors in the NZS group. Additionally, a greater theta event-related synchronization (ERS) was observed solely when participants exhibited aggression in the NZS group. The type of group moderated the association between posterior theta-ERS and cooperative rates. Specifically, theta-ERS was negatively associated with cooperative rates in the NZS group, whereas a reversed association was found in the ZS group. These findings provide valuable insights into the neurobiological foundations of cooperation under different economic payoff norms.
社会互动中的合作与竞争对社会发展至关重要。有许多研究探讨了这些行为背后的神经机制；然而，关于收益规范在社会互动中的潜在作用却知之甚少。本研究引入了两种不同的收益规范：零和（ZS）和非零和（NZS）。在ZS组中，只有总分最高的玩家才能获得奖励；而在NZS组中，奖励由双方玩家的总得分决定，个人奖励根据每个玩家对总分的贡献按比例分配。本研究使用脑电图来检测这些不同组在斗鸡博弈过程中个体的神经反应。行为学研究结果显示，与ZS组相比，NZS组的合作率更高。对手的攻击性行为在两组中均引发了更大的反馈相关负波（FRN）和更低的P300波幅。值得注意的是，与合作行为相比，ZS组中参与者的攻击性行为引发了更大的FRN和更小的P300波幅，而在NZS组中，攻击性行为引发的P300波幅比合作行为更大。此外，仅当参与者在NZS组中表现出攻击性时，观察到更大的θ事件相关同步化（ERS）。分组类型调节了后部θ-ERS与合作率之间的关联。具体而言，在NZS组中，θ-ERS与合作率呈负相关，而在ZS组中则发现了相反的关联。这些发现为不同经济收益规范下合作的神经生物学基础提供了有价值的见解。
