Cited by 101Neurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology StudiesReinforcement Learning in Robotics

Belief state representation in the dopamine system

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Babayan, Benedicte M., Uchida, Naoshige, Gershman, Samuel. J.·2018·Nature Communications

Abstract

Learning to predict future outcomes is critical for driving appropriate behaviors. Reinforcement learning (RL) models have successfully accounted for such learning, relying on reward prediction errors (RPEs) signaled by midbrain dopamine neurons. It has been proposed that when sensory data provide only ambiguous information about which state an animal is in, it can predict reward based on a set of probabilities assigned to hypothetical states (called the belief state). Here we examine how dopamine RPEs and subsequent learning are regulated under state uncertainty. Mice are first trained in a task with two potential states defined by different reward amounts. During testing, intermediate-sized rewards are given in rare trials. Dopamine activity is a non-monotonic function of reward size, consistent with RL models operating on belief states. Furthermore, the magnitude of dopamine responses quantitatively predicts changes in behavior. These results establish the critical role of state inference in RL.

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  • Previous work showed that dopamine activity of animals trained on the Babayan task depended on the number of trials in the current block, similar to what would be expected if animals used a belief representation.

    “Previous work showed that the dopamine activity of animals trained on this task depended on the number of trials in the current block (Fig 7C), similar to what you would expect if animals used a belief representation (Fig 7D, dashed lines) [10].”
  • In the Babayan task, block identity was hidden to the animal and was resampled uniformly every five trials.

    “Importantly, the block identity was hidden to the animal, and was resampled uniformly every five trials.”
  • In the Babayan task, reward quantity was varied in blocks: Block 1 had a small (1 μL) reward and Block 2 had a large (10 μL) reward.

    “In Block 1, each trial consisted of a small (1 μL) reward, while in Block 2 each trial consisted of a large (10 μL) reward.”
  • RNNs can be trained to optimally estimate value in two previously studied associative learning tasks.

    “We first show that RNNs can be trained to optimally estimate value in two previously studied associative learning tasks [7,10], and that the RPEs of these models resemble experimentally observed dopamine neuron activity.”
  • In the Babayan et al. (2018) task, each trial consisted of an odor followed by a deterministic reward.

    “In this task, similar to Task 1 of Starkweather et al. (2017) [7], each trial consisted of an odor followed by a deterministic reward.”

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Authors
Babayan, B. M., Uchida, N., & Gershman, S. J.
Affiliations
Harvard University (US)
Corresponding author
  • Uchida, Naoshige
  • Gershman, Samuel. J.
Venue
Nature Communications
Published
2018-05-14
Volume
9
Issue
1
Pages
1891-1891
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2801251491
Cited by
101
References
55
Citations by year
2026: 9 · 2025: 14 · 2024: 10 · 2023: 9 · 2022: 10 · 2021: 18 · 2020: 17 · 2019: 6 · 2018: 8
FWCI
5.58
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (R01MH101207, R01MH095953, R01MH109177)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Physical Sciences › Computer Science › Artificial Intelligence › Reinforcement Learning in Robotics
Keywords
belief states, dopamine, reward prediction error, reinforcement learning, state uncertainty, state inference, midbrain dopaminergic neurons, reward magnitude, mice
MeSH terms
Animals, Dopamine, Electrodes, Implanted, Learning, Male, Reinforcement, Psychology, Reward, Stereotaxic Techniques, Uncertainty, Mice, Anticipation, Psychological, Dopaminergic Neurons, Ventral Striatum

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