Cited by 82Neurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology StudiesMemory and Neural Mechanisms

Dynamic shaping of dopamine signals during probabilistic Pavlovian conditioning

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Hart, Andrew S., Clark, Jeremy J., Phillips, Paul E.M.·2015·Neurobiology of Learning and Memory

Abstract

Cue- and reward-evoked phasic dopamine activity during Pavlovian and operant conditioning paradigms is well correlated with reward-prediction errors from formal reinforcement learning models, which feature teaching signals in the form of discrepancies between actual and expected reward outcomes. Additionally, in learning tasks where conditioned cues probabilistically predict rewards, dopamine neurons show sustained cue-evoked responses that are correlated with the variance of reward and are maximal to cues predicting rewards with a probability of 0.5. Therefore, it has been suggested that sustained dopamine activity after cue presentation encodes the uncertainty of impending reward delivery. In the current study we examined the acquisition and maintenance of these neural correlates using fast-scan cyclic voltammetry in rats implanted with carbon fiber electrodes in the nucleus accumbens core during probabilistic Pavlovian conditioning. The advantage of this technique is that we can sample from the same animal and recording location throughout learning with single trial resolution. We report that dopamine release in the nucleus accumbens core contains correlates of both expected value and variance. A quantitative analysis of these signals throughout learning, and during the ongoing updating process after learning in probabilistic conditions, demonstrates that these correlates are dynamically encoded during these phases. Peak CS-evoked responses are correlated with expected value and predominate during early learning while a variance-correlated sustained CS signal develops during the post-asymptotic updating phase.

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  • One of the computational quantities encoded by variations in dopamine release is uncertainty (inverse precision).

    “This is because various neurophysiological studies in humans and animals indicate that one of the computational quantities encoded by variations in dopamine release is uncertainty (inverse precision) (Fiorillo et al., 2003; de Lafuente and Romo, 2011; Hart et al., 2015; Schwartenbeck et al., 2015a; Tomassini et al., 2016).”

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Authors
Hart, A. S., Clark, J. J., & Phillips, P. E. M.
Affiliations
University of Washington (US)
Corresponding author
Phillips, Paul E.M.
Venue
Neurobiology of Learning and Memory
Publisher
Elsevier BV
Published
2015-01
Volume
117
Pages
84-92
ISSN
1074-7427 (ISSN-L)
OpenAlex
W2084791965
Cited by
82
References
26
Citations by year
2026: 3 · 2025: 3 · 2024: 4 · 2023: 5 · 2022: 10 · 2021: 9 · 2020: 8 · 2019: 11 · 2018: 6 · 2017: 8 · 2016: 6 · 2015: 8 · 2014: 1
FWCI
3.50
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Learning and Memory (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
NIH (T32-DA007278, R01-AA021121, R01-DA027858, R01-AG044839, R01-MH079292)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
dopamine release, nucleus accumbens core, reward prediction error, expected value, reward variance, uncertainty encoding, reinforcement learning, conditioned stimulus, fast-scan cyclic voltammetry, learning dynamics
MeSH terms
Animals, Conditioning, Classical, Cues, Dopamine, Male, Nucleus Accumbens, Probability, Reinforcement, Psychology, Reward, Rats, Sprague-Dawley, Rats

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