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  Internal state dynamics shape brainwide activity and foraging behaviour

Marques, J., Li, M., Schaak, D., Robson, D., & Li, J. (2020). Internal state dynamics shape brainwide activity and foraging behaviour. Nature, 577(7789), 239-243. doi:10.1038/s41586-019-1858-z.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-6564-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-72A3-2
Genre: Journal Article

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Marques, JC, Author
Li, M1, 2, Author              
Schaak, D, Author
Robson, DN1, 2, Author              
Li, JM1, 2, Author              
Affiliations:
1Research Group Systems Neuroscience & Neuroengineering, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_3168483              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: The brain has persistent internal states that can modulate every aspect of an animal’s mental experience1,2,3,4. In complex tasks such as foraging, the internal state is dynamic5,6,7,8. Caenorhabditis elegans alternate between local search and global dispersal5. Rodents and primates exhibit trade-offs between exploitation and exploration6,7. However, fundamental questions remain about how persistent states are maintained in the brain, which upstream networks drive state transitions and how state-encoding neurons exert neuromodulatory effects on sensory perception and decision-making to govern appropriate behaviour. Here, using tracking microscopy to monitor whole-brain neuronal activity at cellular resolution in freely moving zebrafish larvae9, we show that zebrafish spontaneously alternate between two persistent internal states during foraging for live prey (Paramecia). In the exploitation state, the animal inhibits locomotion and promotes hunting, generating small, localized trajectories. In the exploration state, the animal promotes locomotion and suppresses hunting, generating long-ranging trajectories that enhance spatial dispersion. We uncover a dorsal raphe subpopulation with persistent activity that robustly encodes the exploitation state. The exploitation-state-encoding neurons, together with a multimodal trigger network that is associated with state transitions, form a stochastically activated nonlinear dynamical system. The activity of this oscillatory network correlates with a global retuning of sensorimotor transformations during foraging that leads to marked changes in both the motivation to hunt for prey and the accuracy of motor sequences during hunting. This work reveals an important hidden variable that shapes the temporal structure of motivation and decision-making.

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 Dates: 2019-112019-122020-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41586-019-1858-z
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Title: Nature
Source Genre: Journal
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Pages: - Volume / Issue: 577 (7789) Sequence Number: - Start / End Page: 239 - 243 Identifier: ISSN: 0028-0836