Lateral prefrontal/orbitofrontal cortex has different roles in norm compliance in gain and loss domains: a transcranial direct current stimulation study |
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| Authors: | Zhongbin Su Yuan Zhang Xiaolin Zhou |
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| Affiliation: | 1. School of Psychological and Cognitive Sciences and Center for Brain and Cognitive Sciences, Peking University, Beijing, China;2. Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA;3. Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, China;4. Key Laboratory of Machine Perception (Ministry of Education), Peking University, Beijing, China;5. PKU‐IDG/McGovern Institute for Brain Research, Peking University, Beijing, China |
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| Abstract: | Sanction is used by almost all known human societies to enforce fairness norm in resource distribution. Previous studies have consistently shown that the lateral prefrontal cortex (lPFC) and the adjacent orbitofrontal cortex (lOFC) play a causal role in mediating the effect of sanction threat on norm compliance. However, most of these studies were conducted in gain domain in which resources are distributed. Little is known about the mechanisms underlying norm compliance in loss domain in which individual sacrifices are needed. Here we employed a modified version of dictator game (DG) and high‐definition transcranial direct current stimulation (HD‐tDCS) to investigate to what extent lPFC/lOFC is involved in norm compliance (with and without sanction threat) in both gain‐ and loss‐sharing contexts. Participants allocated a fixed total amount of monetary gain or loss between themselves and an anonymous partner in multiple rounds of the game. A computer program randomly decided whether a given round involved sanction threat for the participants. Results showed that disruption of the right lPFC/lOFC by tDCS increased the voluntary norm compliance in the gain domain, but not in the loss domain; tDCS on lPFC/lOFC had no effect on compliance under sanction threat in either the gain or loss domain. Our findings reveal a context‐dependent nature of norm compliance and differential roles of lPFC/lOFC in norm compliance in gain and loss domains. |
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| Keywords: | gain‐loss domain HD‐tDCS lateral prefrontal and orbitofrontal cortex (LPFC/LOFC) norm compliance sanction threat |
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