Department of Psychology, Korea University, Seoul, South Korea.
J Cogn Neurosci. 2012 Feb;24(2):428-39. doi: 10.1162/jocn_a_00136. Epub 2011 Sep 26.
Despite the prevalence and potentially harmful consequences of first impression bias during social decision-making, its precise neural underpinnings remain unclear. Here, on the basis of the fMRI study using ultimatum games, the authors show that the responders' decisions to accept or reject offers were significantly affected by facial trustworthiness of proposers. Analysis using a model-based fMRI method revealed that activity in the right lateral OFC (lOFC) of responders increased as a function of negative decision bias, indicating a greater likelihood of rejecting otherwise fair offers, possibly because of the facial trustworthiness of proposers. In addition, lOFC showed changes in functional connectivity strength with amygdala and insula as a function of decision bias, and individual differences in the strengths of connectivities between lOFC and bilateral insula were also found to predict the likelihood of responders to reject offers from untrustworthy-looking proposers. The present findings emphasize that the lOFC plays a pivotal role in integrating signals related to facial impression and creating signal biasing decisions during social interactions.
尽管在社会决策过程中第一印象偏见普遍存在且可能具有潜在的有害后果，但它的确切神经基础仍不清楚。在这里，作者基于使用最后通牒博弈的 fMRI 研究表明，响应者接受或拒绝提议的决定受到提议者面部可信度的显著影响。使用基于模型的 fMRI 方法进行的分析表明，响应者右侧外侧眶额皮层（lOFC）的活动随着负面决策偏差而增加，这表明更有可能拒绝原本公平的提议，这可能是因为提议者的面部可信度。此外，lOFC 与杏仁核和岛叶之间的功能连接强度随决策偏差而变化，并且还发现 lOFC 与双侧岛叶之间连接强度的个体差异可预测响应者拒绝看起来不可信的提议者提供的提议的可能性。本研究结果强调，lOFC 在整合与面部印象相关的信号和在社交互动中创建信号偏向决策方面发挥着关键作用。
