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Related Experiment Video

Updated: Jun 26, 2026

Assessment of Social Cognition in Non-human Primates Using a Network of Computerized Automated Learning Device (ALDM) Test Systems
08:42

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Published on: May 5, 2015

Reinforcement learning signal predicts social conformity.

Vasily Klucharev1, Kaisa Hytönen, Mark Rijpkema

  • 1Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen, 6500 HB Nijmegen, The Netherlands. v.klucharev@fcdonders.ru.nl

Neuron
|January 17, 2009
PubMed
Summary

Social conformity, or changing decisions to match group behavior, is driven by reinforcement learning mechanisms. Brain signals in the rostral cingulate zone and ventral striatum predict and reflect this conforming behavior.

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Area of Science:

  • Neuroscience
  • Social Psychology
  • Decision Science

Background:

  • Social conformity is a common human behavior, yet its underlying neural basis is not fully understood.
  • Understanding how group norms influence individual judgment is crucial for social cognition research.

Purpose of the Study:

  • To investigate the neural mechanisms of social conformity using functional magnetic resonance imaging (fMRI).
  • To determine if reinforcement learning principles explain how individuals adjust judgments to align with group opinion.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to monitor brain activity.
  • Participants' judgments of facial attractiveness were recorded and compared with group opinions.
  • Neuronal responses, particularly 'prediction error' signals, were analyzed in relation to conformity.

Main Results:

  • Conformity to group opinion in attractiveness judgments was observed.
  • Conflict with group opinion elicited neural responses in the rostral cingulate zone and ventral striatum, akin to reinforcement learning's 'prediction error' signal.
  • The magnitude of this conflict signal predicted subsequent behavioral conformity, with individual differences in ventral striatum activity correlating with conformity levels.

Conclusions:

  • Social conformity is mediated by reinforcement learning mechanisms.
  • The rostral cingulate zone and ventral striatum play key roles in processing social norm conflicts and driving conformity.
  • These findings elucidate the neural underpinnings of social influence and group behavior.