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The basal ganglia (BG) and cerebellum (CBL) are integral to processing performance outcomes, yet their functional interactions remain underexplored. This study scanned participants\u2019 brains with functional magnetic imaging (fMRI) while they performed a skilled motor task for monetary rewards, where outcomes depended on their motor performance and also probabilistic events that were not contingent on their performance. We found successful motor outcomes increased activity in the ventral striatum (VS), a functional sub-region of the BG, whereas unsuccessful motor outcomes engaged the CBL. In contrast, for probabilistic outcomes unrelated to motor performance, the BG and CBL exhibited no differences in activity between successful and unsuccessful outcomes. Dynamic causal modeling revealed that VS-to-CBL connectivity was inhibitory following successful motor outcomes, suggesting that the VS may suppress CBL error processing for correct actions. Conversely, CBL-to-VS connectivity was inhibitory after unsuccessful motor outcomes, potentially preventing reinforcement of erroneous actions. Additionally, interindividual differences in task preference, assessed by having participants choose between performing the motor task or flipping a coin for monetary rewards, were related to inhibitory VS-CBL connectivity. These findings highlight a performance-mediated functional network between the VS and CBL, modulated by motivation and subjective preferences, supporting goal-directed behavior.<\/jats:p>","DOI":"10.1101\/2025.02.06.636434","type":"posted-content","created":{"date-parts":[[2025,2,7]],"date-time":"2025-02-07T04:35:56Z","timestamp":1738902956000},"source":"Crossref","is-referenced-by-count":1,"title":["Striatal and cerebellar interactions during reward-based motor performance"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-4848-3054","authenticated-orcid":false,"given":"Joonhee Leo","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA"},{"name":"Center for Movement Studies, Kennedy Krieger Institute, Baltimore, MD, 21205, 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