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From affective value to decision-making in the prefrontal cortex.

Fabian Grabenhorst1, Edmund T Rolls, Benjamin A Parris

  • 1Department of Experimental Psychology, University of Oxford, Oxford, UK.

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Brain imaging reveals distinct neural pathways for evaluating reward value and making choices. These findings differentiate how we represent feelings from how we decide on actions.

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Area of Science:

  • Neuroscience
  • Decision Science
  • Affective Science

Background:

  • Representing affective value and making decisions about rewards may involve separate neural processes.
  • Understanding these distinct processes is crucial for comprehending goal-directed behavior.

Purpose of the Study:

  • To investigate the neural separation between representing affective value and making binary decisions about rewards.
  • To identify brain regions involved in continuous affective valuation versus discrete choice-making.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Participants rated the affective value of thermal stimuli (warm, cold, combinations) on a continuous scale or made a yes/no decision about stimulus repetition.
  • Contrasting brain activations between rating and decision tasks identified distinct neural correlates.

Main Results:

  • Binary decision-making (yes/no) was associated with activations in the medial prefrontal cortex (area 10).
  • Continuous affective value representation (pleasantness ratings) engaged the pregenual cingulate and orbitofrontal cortex.
  • Initiating actions for goals (yes/no decisions) involved the dorsal cingulate cortex, anterior insula, and ventral tegmental area.

Conclusions:

  • Affective valuation and binary decision-making are neurally dissociable processes.
  • Specific brain regions support continuous affective representation, while others are involved in discrete choice and action initiation.
  • These findings elucidate the neural architecture underlying reward processing and motivated behavior.