Multiplexed action-outcome representation by striatal striosome-matrix compartments detected with a mouse cost-benefit foraging task

Bernard Bloem, Rafiq Huda, Ken-ichi Amemori, Alex S. Abate, Gayathri Krishna, Anna L. Wilson, Cody W. Carter, Mriganka Sur and Ann M. Graybiel ()
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Bernard Bloem: Massachusetts Institute of Technology
Rafiq Huda: Massachusetts Institute of Technology
Ken-ichi Amemori: Kyoto University
Alex S. Abate: Massachusetts Institute of Technology
Gayathri Krishna: Massachusetts Institute of Technology
Anna L. Wilson: Massachusetts Institute of Technology
Cody W. Carter: Massachusetts Institute of Technology
Mriganka Sur: Massachusetts Institute of Technology
Ann M. Graybiel: Massachusetts Institute of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-17

Abstract: Abstract Learning about positive and negative outcomes of actions is crucial for survival and underpinned by conserved circuits including the striatum. How associations between actions and outcomes are formed is not fully understood, particularly when the outcomes have mixed positive and negative features. We developed a novel foraging (‘bandit’) task requiring mice to maximize rewards while minimizing punishments. By 2-photon Ca++ imaging, we monitored activity of visually identified anterodorsal striatal striosomal and matrix neurons. We found that action-outcome associations for reward and punishment were encoded in parallel in partially overlapping populations. Single neurons could, for one action, encode outcomes of opposing valence. Striosome compartments consistently exhibited stronger representations of reinforcement outcomes than matrix, especially for high reward or punishment prediction errors. These findings demonstrate multiplexing of action-outcome contingencies by single identified striatal neurons and suggest that striosomal neurons are particularly important in action-outcome learning.

Date: 2022
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DOI: 10.1038/s41467-022-28983-5

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