ePoster

Coding of whisker touch and movement in dysgranular somatosensory cortex

Alisha Ahmed, Maya Laughton, Simon Peron
FENS Forum 2024(2024)
Messe Wien Exhibition & Congress Center, Vienna, Austria

Conference

FENS Forum 2024

Messe Wien Exhibition & Congress Center, Vienna, Austria

Resources

Authors & Affiliations

Alisha Ahmed, Maya Laughton, Simon Peron

Abstract

In the mouse whisker system, somatosensory thalamus outputs to primary and secondary vibrissal somatosensory cortices (vS1 and vS2), as well as the dysgranular zone, a strip of cortex between the vibrissal and forepaw primary somatosensory cortices. Despite extensive studies of vS1 and vS2, the dysgranular zone’s response to whisker touch remains unknown. Vibrissal S1 sends outputs to three areas within the dysgranular zone: the anteromedial (AM), centromedial (CM), and posteromedial (PM) areas, each of which shows robust responses to whisker touch. We trained mice trimmed to two whiskers to actively palpate a pole with their whiskers, reporting touch of the pole with licks to one of two lickports and no touch with licks to the other. We recorded activity in layers 2-4 of vS1, vS2, AM, CM, and PM using volumetric two-photon calcium imaging. We compared touch, whisker movement, and licking activity across all areas. We found that touch, whisker movement, and licking representations are sparse in all areas, each making up less than 10% of all neurons imaged in each area. Neurons responding to multiple whiskers increased in frequency in the anterior dysgranular zone subregions, whereas neurons responding to a single whisker increased in frequency in the more posterior subregion. We also found that across all areas, neurons responding to multiple whiskers were more likely to participate in motor representations. These findings suggest that touch and motor information are represented sparsely across sensorimotor areas, likely integrated by broadly tuned neurons that respond to touch by multiple whiskers.

Unique ID: fens-24/coding-whisker-touch-movement-dysgranular-055a8121