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Distributed neural replay of decision confidence mediates informational conformity

By Ali Mahmoodi, Hamed Nili, Carsten Mehring, Bahador Bahrami

Posted 07 Aug 2019
bioRxiv DOI: 10.1101/728428

We occasionally receive conflicting views from others. To maximize accuracy, we should exercise informational conformity by changing our mind proportional to our confidence about our initial view. This account predicts that neural correlates of confidence in the private decision should be replayed as the private and social information are integrated. In a perceptual estimation task (N=120), influence from others was proportional to private confidence. Human fMRI (N=20) showed that consistent with the replay hypothesis, confidence covaried with temporally distributed activity during private estimate (Precuneus and dorsal anterior cingulate cortex, dACC), social change of mind (dACC) and social outcome (dorsolateral prefrontal cortex and dACC). During social change of mind and only when paired with alleged human (but not with computer) partners, left temproparietal junction carried information about participants' social use of confidence. Our study reveals the neuronal substrates of the role of confidence in computational implementation of informational conformity.

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