Journal
CEREBRAL CORTEX
Volume 23, Issue 12, Pages 2872-2883Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhs269
Keywords
EEG; social neuroscience; decision-making; mediofrontal negativity; ultimatum game
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Funding
- CONICYT [24100226]
- Millenium Center for the Neuroscience of Memory, Chile [NC10-001-F]
- Ministry for Economics, Fomentation and Tourism, Chile
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In social interactions, the perception of how risky our decisions are depends on how we anticipate other peoples behaviors. We used electroencephalography to study the neurobiology of perception of social risk, in subjects playing the role of proposers in an iterated ultimatum game in pairs. Based on statistical modeling, we used the previous behaviors of both players to separate high-risk [HR] offers from low-risk [LR] offers. The HR offers present higher rejection probability and higher entropy (variability of possible outcome) than the LR offers. Rejections of LR offers elicited both a stronger mediofrontal negativity and a higher prefrontal theta activity than rejections of HR offers. Moreover, prior to feedback, HR offers generated a drop in alpha activity in an extended network. Interestingly, trial-by-trial variation in alpha activity in the medial prefrontal, posterior temporal, and inferior pariental cortex was specifically modulated by risk and, together with theta activity in the prefrontal and posterior cingulate cortex, predicted the proposers subsequent behavior. Our results provide evidence that alpha and theta oscillations are sensitive to social risk and underlie a fine-tuning regulation of social decisions.
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