腹内侧前额叶或削弱不公平心率反应与规范决策价值计算之间的关联

Emotional reactions to norm violations influence how people trade-off selfish interests against social norms, but it remains unknown which brain regions contribute to integrating physiological (e.g. heart rate) responses to norm violations into the decision process. Here, we provide evidence that the ventromedial prefrontal cortex (vmPFC) attenuates the link between value computations in normative choice and physiological heart rate responses to norm violations. Excitatory brain stimulation over the vmPFC reduced aversion to disadvantageous inequality in an Ultimatum game and increased post-decision confidence after acceptance of unfair monetary splits. Physiological heart rate responses were increased in response to splits perceived as unfair. Enhancing vmPFC excitability reduced the sensitivity to unfairness not by directly reducing heart rate reactions to unfairness but by de-correlating them from the decision process. This suggests that vmPFC moderates the association between physiological heart rate responses to norm violations and trade-offs between self-interests versus norm considerations, highlighting its key role for integrating emotional and cognitive processes in decision making.

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