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Vendredi de Neuro-PSI le 20 septembre 2019

Vendredi 20 septembre à 11h00, en salle de conférences Alfred Fessard, bâtiment 32, CNRS Gif-Sur-Yvette, Professor Daniel Feldman du Helen Wills Neuroscience Institute, Dept. of Molecular & Cell Biology, UC Berkeley, présente un exposé intitulé
« Maps and neural codes in whisker somatosensory cortex »

 


- mcb.berkeley.edu/labs/feldman/

Invitation : Daniel Shulz

- Voir le pdf

 

Résumé

Sensory maps are a canonical feature of sensory cortex, but their precise organization and how they impact sensory coding are often unclear. Maps, sensory coding, and plasticity can be studied efficiently in rodent somatosensory cortex (S1), which contains a map of the facial whiskers. Whiskers are active tactile sensors that extract information about the location, shape, and surface properties of objects. In the classical ‘one-whisker-one-column’ model of S1, each whisker activates one cortical column in S1, whose neurons act as single-whisker feature detectors. But cellular-resolution calcium imaging reveals a different, salt-and-pepper organization in L2/3 in which intermixed cells within each column are tuned to different whiskers. Recent studies have shown how this salt-and-pepper map arises in the S1 circuit, how it is structured in awake, behaving animals, and how it is modified by sensory experience.

S1 also prominently encodes natural features of tactile objects, with coding principles that are just being discovered. Recent studies show that S1 encodes complex spatiotemporal patterns of whisker deflection, which are the dominant signal during natural whisking on objects. We recently discovered that most S1 neurons are sharply tuned within an elementary subspace of 2-whisker sequences that represent local motion vectors on the whisker pad. This tuning is highly organized in the S1 map, with each cortical column representing the set of all local motion vectors involving the columnar whisker. This tuning for local tactile motion is analogous to direction selectivity in vision, suggesting a common neural computation across touch and visual systems.

 

Agenda

  • Vendredi 20 septembre 11:00-12:00 - Daniel E. Feldman - Helen Wills Neuroscience Institute and Dept. of Molecular & Cell Biology, UC Berkeley

    Maps and neural codes in whisker somatosensory cortex

    Résumé : Invitation Daniel Shulz

    Lieu : Salle de Conférences Alfreed Fessard - Bâtiment 32 CNRS DR4, 1, avenue de la Terrasse Gif-Sur-Yvette


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