Author

Sam Hewitt

Wellcome Centre for Human NeuroimagingORCID 0000-0002-9219-6324Unclaimed ORCID profile · follow to get notified of new preprints

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Neuroscience· 1

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Research Focus:differential expression· 1 Organism:human· 1 Approach:machine learning (classical)· 1 Approach:statistical model· 1

Frequent Co-Authors

Arnaud ZaltaiD· 1 shared Charles FindlingiD· 1 shared Matthew M. NouriD· 1 shared Michael MoutoussisiD· 1 shared Raymond J. DolaniD· 1 shared Tobias U. HauseriD· 1 shared Valentin WyartiD· 1 shared Vasilisa SkvortsovaiD· 1 shared

Activity by Year

2025-2025 · peak 1/yr

Co-Author Collaboration Network

8 top collaborators · 28 mutual co-author links

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1 shared paperNeuroscience

Arnaud ZaltaORCID

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1 paper

Recent·Most cited

Dopamine drives a positive reward bias on human reinforcement learning

Arnaud Zalta, Vasilisa Skvortsova, Sam Hewitt, Michael Moutoussis, Matthew M. Nour, Raymond J. Dolan, Charles Findling, Tobias U. Hauser, Valentin Wyart

This study investigates how dopamine affects reinforcement learning in humans using L-DOPA and finds it reduces switching after low rewards and influences learning rate and precision.

bioRxiv · Dec 26, 2025 · PreprintNeuroscience