Short Time-Scale Sensory Coding in S1 during Discrimination of Whisker Vibrotactile Sequences.

Abstract:

:Rodent whisker input consists of dense microvibration sequences that are often temporally integrated for perceptual discrimination. Whether primary somatosensory cortex (S1) participates in temporal integration is unknown. We trained rats to discriminate whisker impulse sequences that varied in single-impulse kinematics (5-20-ms time scale) and mean speed (150-ms time scale). Rats appeared to use the integrated feature, mean speed, to guide discrimination in this task, consistent with similar prior studies. Despite this, 52% of S1 units, including 73% of units in L4 and L2/3, encoded sequences at fast time scales (≤20 ms, mostly 5-10 ms), accurately reflecting single impulse kinematics. 17% of units, mostly in L5, showed weaker impulse responses and a slow firing rate increase during sequences. However, these units did not effectively integrate whisker impulses, but instead combined weak impulse responses with a distinct, slow signal correlated to behavioral choice. A neural decoder could identify sequences from fast unit spike trains and behavioral choice from slow units. Thus, S1 encoded fast time scale whisker input without substantial temporal integration across whisker impulses.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

McGuire LM,Telian G,Laboy-Juárez KJ,Miyashita T,Lee DJ,Smith KA,Feldman DE

doi

10.1371/journal.pbio.1002549

subject

Has Abstract

pub_date

2016-08-30 00:00:00

pages

e1002549

issue

8

eissn

1544-9173

issn

1545-7885

pii

PBIOLOGY-D-16-00249

journal_volume

14

pub_type

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