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Decomposing the neural pathways in a simple, value-based choice.

Timothy R Koscik1, Vincent Man2, Andrew Jahn3

  • 1University of Iowa, Roy J. & Lucille A. Carver College of Medicine, Department of Psychiatry, Iowa City, IA, 52242, USA; Department of Psychology, University of Toronto, Toronto, ON, M5S 3G3, Canada.

Neuroimage
|March 25, 2020
PubMed
Summary
This summary is machine-generated.

The ventral striatum (vSTR), not vmPFC or PPC, drives value-based choices. This brain region mediates between expected value perception and the decision to accept or decline a gamble, clarifying neural decision-making networks.

Keywords:
Brain-as-predictorDecisionPosterior parietal cortexVentral striatumVentromedial prefrontal cortexfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Decision Neuroscience

Background:

  • Value-based choice is a key research area in neuroscience.
  • Key brain regions implicated include vmPFC, PPC, and vSTR.
  • The precise organization and function within the value-based choice network remain debated.

Purpose of the Study:

  • To isolate neural activity related to valuation and choice selection.
  • To test if identified brain regions mediate between expected value and choice.
  • To elucidate the processing chain within the value-based decision network.

Main Methods:

  • Utilized a gambling task dissociating expected value from outcomes.
  • Applied multilevel mediation analysis to examine interregional relationships.
  • Employed dynamic causal modeling (DCM) to compare network models.

Main Results:

  • vmPFC activity correlated with outcome evaluation, not choice prediction.
  • PPC and bilateral vSTR mediated the relationship between expected value and choice.
  • vSTR fully mediated the influence of PPC on choice, confirmed by DCM.

Conclusions:

  • The ventral striatum (vSTR) is identified as a critical driver of choice.
  • vmPFC's role is primarily in outcome evaluation, not direct choice mediation.
  • Findings clarify the functional roles and interregional communication within the value-based choice network.