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Statistical Physics and Condensed Matter Seminars

Seminar organized by the two teams of the group Statistical Mechanics and Condensed Matter.

Persons in charge: Alain BARRAT and Thibaut JONCKHEERE
Dedicated Day: Wednesday 16:00
Place: CPT, Amphitheater on the 5th floor
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Next Statistical Physics and Condensed Matter Seminars

Thursday 5 April

14h00 – 15h00, Amphi 5 du CPT

Séminaire de Physique Statistique & Matière Condensée

Alexis Dubreuil (ENS, Paris)

Titre: A sensory-motor hub driving photo-taxis in zebrafish

Résumé: Animals continuously gather sensory cues in order to move towards favorable environments. Efficient goal-directed navigation requires sensory perception and motor command to be intertwined in a feedback loop, yet the neural substrate underlying this sensorimotor task in the vertebrate brain remains elusive. Here we present analysis of whole-brain calcium recordings together with circuit modeling to reveal the neural mechanisms through which zebrafish performs phototaxis, i.e. actively orients towards a light source. Key to this process is a self-oscillating hindbrain network that acts as a pacemaker for ocular saccades and controls the orientation of successive swim-bouts. It further integrates visual stimuli in a state dependent manner, i.e. its response to visual inputs varies with the motor context, a mechanism that manifests itself in the phase-locked entrainment of the circuit by periodic stimuli. A rate model is developed that reproduces our observations and demonstrates how this sensorimotor processing eventually biases the animal trajectory towards bright regions.

Seminars to come

No other seminar scheduled.