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Reward encoding in the monkey anterior cingulate cortex.

C Amiez1, J P Joseph, E Procyk

  • 1Department of Cognitive Neurosciences, Inserm U371 Cerveau et Vision, IFR19, UCB-Lyon1, 18 av. Doyen Lépine, 69500 Bron, France. camiez@bic.mni.mcgill.ca

Cerebral Cortex (New York, N.Y. : 1991)
|October 7, 2005
PubMed
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The anterior cingulate cortex (ACC) helps adapt behavior to uncertain rewards. ACC activity predicts task value, guiding monkeys to find the best reward stimulus, even when outcomes are unknown.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Background:

  • The anterior cingulate cortex (ACC) is recognized for its role in rapid behavioral adjustments based on immediate reward values.
  • Its involvement in long-term adaptations to uncertain outcomes remains less understood.

Purpose of the Study:

  • To investigate the role of the ACC in long-term behavioral adaptation within probabilistic reward contexts.
  • To determine if ACC activity encodes abstract task values crucial for navigating uncertainty.

Main Methods:

  • Macaque monkeys were trained in a probabilistic task requiring identification of an optimal stimulus based on theoretical average reward value ('task value').
  • Neuronal activity in the ACC was recorded, focusing on pre-reward activity.
  • The ACC was temporarily deactivated using muscimol to assess its causal role in behavior.

Related Experiment Videos

Main Results:

  • ACC neuronal activity prior to reward discovery consistently correlated with the task value.
  • Deactivation of the ACC significantly impaired the monkeys' ability to search for and identify the optimal stimulus.

Conclusions:

  • The ACC plays a critical role in long-term adaptation of voluntary, reward-based behaviors.
  • The ACC encodes general task values and received rewards, facilitating adaptive decision-making under uncertainty.