Journal article

Low-threshold afferent signalling of viscous loads during voluntary movements of the human digits

Penelope A McNulty, Victoria Galea, James B Fallon, Leah R Bent, Vaughan Macefield

NEUROREPORT | LIPPINCOTT WILLIAMS & WILKINS | Published : 2008

Abstract

Humans can discriminate changes in load viscosity during voluntary contractions. The afferent signal origin is unknown. Microneurographic recordings from 83 single low-threshold afferents were made while participants performed triangular ramps either unloaded or with a viscous load. The neural discharges for each cycle were compared across load and velocity. Fifty-eight afferents did not respond. Afferents with sufficient activity were classified as ambiguous--discharges correlated to velocity and load (n=4), infinite viscosity--strong load and weak velocity signal (n=6), no viscosity--strong velocity and weak load signal (n=10) and those with neither (n=5). No single class of afferent provi..

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University of Melbourne Researchers