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Representation of Moving Wavefronts of Whisker Deflection in Rat Somatosensory Cortex

Section of Neurobiology, Division of Biological Science, University of California, San Diego, La Jolla, California

Submitted 16 January 2007; accepted in final form 12 June 2007

Rats rhythmically sweep their whiskers over object features, generating sequential deflections of whisker arcs. Such moving wavefronts of whisker deflection are likely to be fundamental elements of natural somatosensory input. To determine how moving wavefronts are represented in somatosensory cortex (S1), we measured single- and multiunit neural responses in S1 of anesthetized rats to moving wavefronts applied through a piezoelectric whisker deflector array. Wavefronts consisted of sequential deflections of individual whisker arcs, which moved progressively across the whisker array. Starting position (starting arc), direction, and velocity of wavefronts were varied. Neurons responded strongly only when wavefront starting position included their principal whisker (PW). When wavefronts started at neighboring positions and swept through the PW, responses to the PW arc were suppressed by 95%, and responses over the entire wavefront duration were suppressed by 60% compared with wavefronts that initiated with the PW. Suppression occurred with interarc deflection delays of 5 ms, was maximal at 20 ms, and recovered within 100–200 ms. Suppression of PW arc responses during wavefronts was largely independent of wavefront direction. However, layer 2/3 neurons showed direction selectivity for responses to the entire wavefront (the entire sequence of SW and PW arc deflection). Wavefront direction selectivity was correlated with receptive field somatotopy and reflected differential responses to the specific SWs that were deflected first in a wavefront. These results indicate that suppressive interwhisker interactions shape responses to wavefronts, resulting in increased salience of wavefront starting position, and, in some neurons, preference for wavefront direction.

This article has been cited by other articles:

				P. J. Drew and D. E. Feldman Intrinsic Signal Imaging of Deprivation-Induced Contraction of Whisker Representations in Rat Somatosensory Cortex Cereb Cortex, May 30, 2008; (2008) bhn085v1. [Abstract] [Full Text] [PDF]