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Related Experiment Video

Updated: Jan 13, 2026

Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex
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Evidence accumulation from experience and observation in the cingulate cortex.

Ruidong Chen1,2, Setayesh Radkani1,2, Neelima Valluru2

  • 1Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature
|January 7, 2026
PubMed
Summary
This summary is machine-generated.

Humans and monkeys integrate personal experiences and social observations to form beliefs. The anterior cingulate cortex (ACC) in the brain processes this evidence, showing how we learn in social settings.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Primate Behavior

Background:

  • Beliefs about the world are formed and updated through personal experiences and by observing others.
  • The neural mechanisms for integrating experiential and observational evidence remain largely unknown.

Purpose of the Study:

  • To investigate how the brain integrates experiential and observational evidence for belief updating.
  • To identify the neural substrates involved in social learning and evidence accumulation.

Main Methods:

  • A two-player game with volatile hidden states was used to study evidence integration in humans and monkeys.
  • Electrophysiological recordings were performed in animals during the task.
  • Analysis of population activity geometry to understand computational architecture.

Main Results:

  • Both humans and monkeys updated beliefs using both experiential and observational evidence, with experiential evidence being more effective.
  • The anterior cingulate cortex (ACC) was identified as a key region integrating these independent evidence streams.
  • Neural population activity geometry provided insights into the integration process and behavioral asymmetry.

Conclusions:

  • The anterior cingulate cortex (ACC) forms a coherent neural representation of dynamic beliefs by integrating diverse evidence sources.
  • This study elucidates the neural basis for evidence accumulation in social contexts within the primate brain.
  • Findings offer a foundation for understanding social cognition and decision-making under uncertainty.