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Related Experiment Video

Updated: May 24, 2026

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Adaptive coding of reward prediction errors is gated by striatal coupling.

Soyoung Q Park1, Thorsten Kahnt, Deborah Talmi

  • 1Department of Education and Psychology, Freie Universität Berlin, 14195 Berlin, Germany. soyoung.q.park@gmail.com

Proceedings of the National Academy of Sciences of the United States of America
|February 29, 2012
PubMed
Summary

Dopaminergic neurons rescale reward signals to match available rewards, a process now shown to involve brain connectivity changes. This adaptive coding in the striatum is crucial for processing prediction errors in the brain's reward system.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • Dopaminergic neurons in the midbrain exhibit adaptive coding, adjusting their response range to available rewards.
  • This adaptive coding mechanism is crucial for signaling reward prediction errors, which are deviations from expected outcomes.
  • The precise neural implementation of this rescaling process remains largely unelucidated.

Purpose of the Study:

  • To investigate the adaptive coding of reward prediction errors in the human brain.
  • To elucidate the underlying neural mechanisms responsible for the rescaling of reward signals.
  • To examine the role of interregional connectivity in adaptive coding within the reward system.

Main Methods:

  • Utilized human functional magnetic resonance imaging (fMRI) to measure brain activity.
  • Employed a reward prediction task involving varying reward magnitudes.
  • Analyzed effective connectivity between reward-sensitive brain regions, including the striatum, midbrain, and medial prefrontal cortex.

Main Results:

  • Confirmed that reward prediction errors in the human striatum follow an adaptive coding scheme.
  • Demonstrated that this adaptive coding is modulated by dynamic changes in effective connectivity.
  • Identified a magnitude-dependent alteration in interregional connectivity within the reward system.

Conclusions:

  • Striatal reward prediction errors are normalized through adaptive coding.
  • Changes in effective connectivity between the striatum, midbrain, and medial prefrontal cortex gate this adaptive coding process.
  • The brain's reward system utilizes interregional communication adjustments to rescale prediction error signals.