Objective While the functions of sleep are still a matter of debate and may include memory consolidation, brain clearance, anabolism and plasticity, the neural substrates of sleep and wake states are the subject of intense study. Successive sleep-wake cycles rely on an appropriate balance between sleep-promoting nuclei of the brain located in the anterior hypothalamus and, arousal-promoting nuclei from the posterior hypothalamus and the brainstem. My laboratory identified different subsets of hypothalamic cells that controls wakefulness and rapid-eye movement (also called paradoxical) sleep using optogenetics in combination with high-density electrophysiology in freely-behaving mice. We further identified their connections with (and functional modulation of) other sleep-wake circuits throughout the brain. Although we and others have dissected important subcortical and cortical sleep-wake circuits in the brain, the precise mechanism bridging sub-cortical circuits to thalamic and cortical networks remains unclear. I hypothesizes that the thalamus represents a hub that integrates sleep-wake inputs of both subcortical and cortical origin into stable sleep-wake states, through topographically distinct sub-cortical inputs and temporally precise circuit dynamics (spiking pattern, coherence).To test this hypothesis, my experimental objectives are divided into three specific aims: 1) Identify the simultaneous cellular dynamics of thalamo-cortical network activity across sleep-wake states (Observational approach; Year 1-3) 2) Characterize the subcortical modulation of thalamic structures across sleep-wake states (Perturbational approach; Year 2-4) 3) Study the role of TRN/CMT circuits in sleep homeostasis and consciousness (Functional approach; Year 4-5)Completion of this project will provide a mechanistic perspective on sub-cortical, thalamo-cortical and cortical control of sleep-wake states, sleep homeostasis and consciousness in the mammalian brain. Fields of science medical and health sciencesbasic medicinephysiologyhomeostasis Keywords Neural circuits thalamus thalamo-cortical circuits arousal anesthesia consciousness innate behaviour optogenetics Programme(s) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Topic(s) ERC-2016-COG - ERC Consolidator Grant Call for proposal ERC-2016-COG See other projects for this call Funding Scheme ERC-COG - Consolidator Grant Host institution UNIVERSITAET BERN Net EU contribution € 1 915 000,00 Address HOCHSCHULSTRASSE 6 3012 Bern Switzerland See on map Region Schweiz/Suisse/Svizzera Espace Mittelland Bern / Berne Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 1 915 000,00 Beneficiaries (1) Sort alphabetically Sort by Net EU contribution Expand all Collapse all UNIVERSITAET BERN Switzerland Net EU contribution € 1 915 000,00 Address HOCHSCHULSTRASSE 6 3012 Bern See on map Region Schweiz/Suisse/Svizzera Espace Mittelland Bern / Berne Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 1 915 000,00
