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Related Experiment Videos

Modulation of caudate activity by action contingency.

Elizabeth M Tricomi1, Mauricio R Delgado, Julie A Fiez

  • 1Department of Psychology, University of Pittsburgh, PA 15260, USA. elt6@pitt.edu

Neuron
|January 27, 2004
PubMed
Summary

The human caudate nucleus activates when actions lead to rewards, suggesting its role in action reinforcement, not just reward processing. This research clarifies the striatum's function in reward-related behaviors.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Decision Neuroscience

Background:

  • The striatum, particularly the caudate nucleus, is implicated in reward processing.
  • Existing research is unclear on whether striatal activation is due to reward's hedonic value or factors like anticipation or action-performance.

Purpose of the Study:

  • To investigate the role of the caudate nucleus in processing reward-related information.
  • To differentiate between activation driven by reward hedonicity versus action-outcome contingency.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) was employed.
  • An oddball paradigm was used with monetary rewards and punishments.
  • Stimuli were presented randomly, after an anticipatory cue, or after a button press response.

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Main Results:

  • Robust and differential activation of the caudate nucleus was observed.
  • Caudate activation occurred specifically when a contingency between a button press and an outcome was perceived.
  • No significant differential activation was found for reward/punishment alone or with anticipation.

Conclusions:

  • The caudate nucleus's activation is contingent on the perceived link between an action and its outcome.
  • Findings suggest the caudate is involved in reinforcing actions that lead to potential rewards.
  • This challenges the view of the caudate solely processing reward 'per se'.