Abstract
There is general consensus that dopaminergic midbrain neurons signal reward prediction errors, computed as the difference between expected and received reward value. However, recent work in rodents shows that these neurons also respond to errors related to inferred value and sensory features, indicating an expanded role for dopamine beyond learning cached values. Here we utilize a transreinforcer reversal learning task and functional magnetic resonance imaging (fMRI) to test whether prediction error signals in the human midbrain are evoked when the expected identity of an appetitive food odor reward is violated, while leaving value matched. We found that midbrain fMRI responses to identity and value errors are correlated, suggesting a common neural origin for these error signals. Moreover, changes in reward-identity expectations, encoded in the orbitofrontal cortex (OFC), are directly related to midbrain activity, demonstrating that identity-based error signals in the midbrain support the formation of outcome identity expectations in OFC.
Original language | English (US) |
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Article number | 1611 |
Journal | Nature communications |
Volume | 9 |
Issue number | 1 |
DOIs | |
State | Published - Dec 1 2018 |
Funding
Special thanks to International Flavors and Fragrances (S. Warrenburg and A. Dumer) for providing food odorants, and Rachel Reynolds for assistance in fMRI data acquisition. This work was supported by National Institute of Neurological Disorders and Stroke grant T32NS047987 (to J.D.H.), National Institute on Deafness and Other Communication Disorders grant R01DC015426 (to T.K.), and National Institute on Drug Abuse grant R03DA040668 (to T.K.).
ASJC Scopus subject areas
- General Chemistry
- General Biochemistry, Genetics and Molecular Biology
- General Physics and Astronomy