Farrell, Karolina;
Lak, Armin;
Saleem, Aman B;
(2022)
Midbrain dopamine neurons signal phasic and ramping reward prediction error during goal-directed navigation.
Cell Reports
, 41
(2)
, Article 111470. 10.1016/j.celrep.2022.111470.
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Abstract
Goal-directed navigation requires learning to accurately estimate location and select optimal actions in each location. Midbrain dopamine neurons are involved in reward value learning and have been linked to reward location learning. They are therefore ideally placed to provide teaching signals for goal-directed navigation. By imaging dopamine neural activity as mice learned to actively navigate a closed-loop virtual reality corridor to obtain reward, we observe phasic and pre-reward ramping dopamine activity, which are modulated by learning stage and task engagement. A Q-learning model incorporating position inference recapitulates our results, displaying prediction errors resembling phasic and ramping dopamine neural activity. The model predicts that ramping is followed by improved task performance, which we confirm in our experimental data, indicating that the dopamine ramp may have a teaching effect. Our results suggest that midbrain dopamine neurons encode phasic and ramping reward prediction error signals to improve goal-directed navigation.
Type: | Article |
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Title: | Midbrain dopamine neurons signal phasic and ramping reward prediction error during goal-directed navigation |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1016/j.celrep.2022.111470 |
Publisher version: | https://doi.org/10.1016/j.celrep.2022.111470 |
Language: | English |
Additional information: | © 2022 The Authors. Original content in this paper is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). |
Keywords: | dopamine, VTA, Q-learning, miniscope, goal-directed, navigation, virtual reality, reinforcement learning, TD error, ramping |
UCL classification: | UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL |
URI: | https://discovery.ucl.ac.uk/id/eprint/10157536 |
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