Medial prefrontal cortex and striatum mediate the influence of social comparison on the decision process
Medial prefrontal cortex and striatum mediate the influence of social comparison on the decision process
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DOI：
10.1073/pnas.1100892108
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发表时间：
2011-09-20
影响因子：
11.1
通讯作者：
Coricelli, Giorgio
中科院分区：
文献类型：
--
作者：
Bault, Nadege;Joffily, Mateus;Coricelli, Giorgio
我们比较了私人决策和社会决策，以研究社会比较对风险选择影响的神经基础。当参与者在两种彩票中选择时，我们用功能性核磁共振成像测量了他们的大脑活动：在私人条件下，他们观察了未选择的彩票的结果，在社交条件下，他们观察了另一个人选择的彩票的结果。纹状体是一种与奖励相关的大脑结构，当参与者比他们的对手赢得更多（社会收益）时，与孤立获胜相比，纹状体的活动更高；当他们比他们的对手赢得更少（社会损失）时，与私人损失相比，纹状体的活动更低。与社会推理有关的内侧前额叶皮层，被社会收益激活的程度高于其他所有事件。在随后的选择中，对社会收益的敏感性影响了大脑活动和行为。具体来说，纹状体活动与社会收益相关，预测了社会选择过程中内侧前额叶皮层的活动，而经历过的社会收益在后来的试验中诱发了更多的风险和竞争行为。这些结果表明，奖励和社会推理网络之间的相互作用介导了社会比较对决策过程的影响。
We compared private and social decision making to investigate the neural underpinnings of the effect of social comparison on risky choices. We measured brain activity using functional MRI while participants chose between two lotteries: in the private condition, they observed the outcome of the unchosen lottery, and in the social condition, the outcome of the lottery chosen by another person. The striatum, a reward-related brain structure, showed higher activity when participants won more than their counterpart ( social gains) compared with winning in isolation and lower activity when they won less than their counterpart ( social loss) compared with private loss. The medial prefrontal cortex, implicated in social reasoning, was more activated by social gains than all other events. Sensitivity to social gains influenced both brain activity and behavior during subsequent choices. Specifically, striatal activity associated with social gains predicted medial prefrontal cortex activity during social choices, and experienced social gains induced more risky and competitive behavior in later trials. These results show that interplay between reward and social reasoning networks mediates the influence of social comparison on the decision process.