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Evidence accumulation for value computation in the prefrontal cortex during decision making.

Zhongqiao Lin1,2, Chechang Nie1,2, Yuanfeng Zhang1,2

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The orbitofrontal cortex (OFC) transiently encodes individual reward probabilities, while the dorsolateral prefrontal cortex (DLPFC) computes combined probabilities for decision-making during evidence accumulation.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Science

Background:

  • Decision-making involves evaluating options based on accumulated evidence from multiple sources.
  • Understanding how the brain accumulates evidence for value computation during decision-making is crucial but not well-studied.

Purpose of the Study:

  • To investigate the neural mechanisms of evidence accumulation for value computation in the brain during decision-making.
  • To differentiate the roles of the orbitofrontal cortex (OFC) and dorsolateral prefrontal cortex (DLPFC) in processing reward information during sequential evidence integration.

Main Methods:

  • Trained rhesus monkeys on an eye movement decision-making task involving sequential visual stimuli with varying reward probabilities.
  • Recorded neural activity in the OFC and DLPFC to study the encoding of reward probabilities and eye movements.

Main Results:

  • OFC neurons transiently encoded reward probabilities of individual stimuli in the stimulus domain.
  • OFC did not encode combined reward probabilities from multiple stimuli.
  • DLPFC neurons computed combined reward probabilities in the action domain, showing asymmetric mixed selectivity supporting stimulus-to-action transitions.

Conclusions:

  • The OFC and DLPFC exhibit distinct functional roles in value computation during evidence accumulation.
  • OFC is involved in processing individual evidence, while DLPFC integrates evidence for action selection.