Multimodal population study reveals the neurobiological underpinnings of chronotype

Le Zhou, Karin Saltoun, Julie Carrier, Kai-Florian Storch, Robin I. M. Dunbar and Danilo Bzdok ()
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Le Zhou: McGill University
Karin Saltoun: McGill University
Julie Carrier: Université de Montréal
Kai-Florian Storch: McGill University
Robin I. M. Dunbar: University of Oxford
Danilo Bzdok: McGill University

Nature Human Behaviour, 2025, vol. 9, issue 7, 1442-1456

Abstract: Abstract The rapid shifts in society have altered human behavioural patterns, with increased evening activities, increased screen time and changed sleep schedules. As an explicit manifestation of circadian rhythms, chronotype is closely intertwined with physical and mental health. Night owls often exhibit unhealthier lifestyle habits, are more susceptible to mood disorders and have poorer physical fitness compared with early risers. Although individual differences in chronotype yield varying consequences, their neurobiological underpinnings remain elusive. Here we conducted a pattern-learning analysis with three brain-imaging modalities (grey matter volume, white-matter integrity and functional connectivity) and capitalized on 976 phenotypes in 27,030 UK Biobank participants. The resulting multilevel analysis reveals convergence on the basal ganglia, limbic system, hippocampus and cerebellum. The pattern derived from modelling actigraphy wearables data of daily movement further highlighted these key brain features. Overall, our population-level study comprehensively investigates chronotype, emphasizing its close connections with habit formation, reward processing and emotional regulation.

Date: 2025
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DOI: 10.1038/s41562-025-02182-w

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