Wei Zhenyu, Zhao Zhiying, Zheng Yong
Center for Studies of Education and Psychology of Ethnic Minorities in Southwest China, Southwest University, Chongqing, China.
Key Laboratory for NeuroInformation of Ministry of Education, School of Life Sciences and Technology, University of Electronic Science and Technology of China, Chengdu, China.
Front Psychol. 2017 Dec 6;8:2134. doi: 10.3389/fpsyg.2017.02134. eCollection 2017.
Humans tend to reduce inequitable distributions. Previous neuroimaging studies have shown that inequitable decisions are related to brain regions that associated with negative emotion and signaling conflict. In the highly complex human social environment, our opinions and behaviors can be affected by social information. In current study, we used a modified dictator game to investigate the effect of social influence on making an equitable decision. We found that the choices of participants in present task was influenced by the choices of peers. However, participants' decisions were influenced by equitable rather than inequitable group choices. fMRI results showed that brain regions that related to norm violation and social conflict were related to the inequitable social influence. The neural responses in the dorsomedial prefrontal cortex, rostral cingulate zone, and insula predicted subsequent conforming behavior in individuals. Additionally, psychophysiological interaction analysis revealed that the interconnectivity between the dorsal striatum and insula was elevated in advantageous inequity influence versus no-social influence conditions. We found decreased functional connectivity between the medial prefrontal cortex and insula, supplementary motor area, posterior cingulate gyrus and dorsal anterior cingulate cortex in the disadvantageous inequity influence versus no-social influence conditions. This suggests that a disadvantageous inequity influence may decrease the functional connectivity among brain regions that are related to reward processes. Thus, the neural mechanisms underlying social influence in an equitable decision may be similar to those implicated in social norms and reward processing.
人类倾向于减少不公平的分配。先前的神经影像学研究表明，不公平决策与与负面情绪和信号冲突相关的脑区有关。在高度复杂的人类社会环境中，我们的观点和行为会受到社会信息的影响。在当前的研究中，我们使用了一种改良的独裁者博弈来探究社会影响对做出公平决策的作用。我们发现，当前任务中参与者的选择受到同伴选择的影响。然而，参与者的决策受到公平而非不公平的群体选择的影响。功能磁共振成像结果表明，与违反规范和社会冲突相关的脑区与不公平的社会影响有关。背内侧前额叶皮层、喙扣带区和脑岛的神经反应预测了个体随后的从众行为。此外，心理生理交互作用分析显示，在有利不公平影响与无社会影响条件下，背侧纹状体与脑岛之间的相互连接性增强。我们发现，在不利不公平影响与无社会影响条件下，内侧前额叶皮层与脑岛、辅助运动区、后扣带回和背侧前扣带回皮层之间的功能连接性降低。这表明不利的不公平影响可能会降低与奖励过程相关的脑区之间的功能连接性。因此，公平决策中社会影响的神经机制可能与社会规范和奖励处理中涉及的机制相似。
