Neural correlates of informational cascades: brain mechanisms of social influence on belief updating
Neural correlates of informational cascades: brain mechanisms of social influence on belief updating
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DOI：
10.1093/scan/nsu090
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发表时间：
2015-04-01
影响因子：
4.2
通讯作者：
Rieskamp, Joerg
中科院分区：
文献类型：
--
作者：
Huber, Rafael E.;Klucharev, Vasily;Rieskamp, Joerg
当理性行动的个人独立于他们的私人信息做出决定并遵循先前决策者的决定时，信息级联就会发生。在更新信念的过程中，私人和公开的社会信息的权重差异可能会以决定性的方式调节级联开始的概率。通过使用功能性磁共振成像，我们检查了神经活动，而参与者根据两个虚构的股票市场交易员的决定和他们自己的私人信息更新了他们的信念，这导致了购买两种股票中的一种的最终决定。对行为数据的计算建模表明，大多数参与者都过度重视私人信息。在特别倾向于一致性的试验中，超重与开始信息级联的概率呈负相关。私人信息导致的信念更新与额下回/前额叶、背外侧前额叶皮层和顶叶皮层的活动有关;参与者对私人信息的重视程度越高，额下回/前额叶的活动就越高，顶叶-颞叶皮层的活动就越低。这项研究探讨了私人信息的过度加权的神经相关性，这是启动信息级联的趋势的基础。
Informational cascades can occur when rationally acting individuals decide independently of their private information and follow the decisions of preceding decision-makers. In the process of updating beliefs, differences in the weighting of private and publicly available social information may modulate the probability that a cascade starts in a decisive way. By using functional magnetic resonance imaging, we examined neural activity while participants updated their beliefs based on the decisions of two fictitious stock market traders and their own private information, which led to a final decision of buying one of two stocks. Computational modeling of the behavioral data showed that a majority of participants overweighted private information. Overweighting was negatively correlated with the probability of starting an informational cascade in trials especially prone to conformity. Belief updating by private information was related to activity in the inferior frontal gyrus/anterior insula, the dorsolateral prefrontal cortex and the parietal cortex; the more a participant overweighted private information, the higher the activity in the inferior frontal gyrus/anterior insula and the lower in the parietal-temporal cortex. This study explores the neural correlates of overweighting of private information, which underlies the tendency to start an informational cascade.