Is human muscle spindle afference dependent on perceived size of error in visual tracking?

Experimental Brain Research
N KakudaA Vallbo

Abstract

Impulses of 16 muscle spindle afferents from finger extensor muscles were recorded from the radial nerve along with electromyographic (EMG) activity and kinematics of joint movement. Twelve units were classified as Ia and 4 as II spindle afferents. Subjects were requested to perform precision movements at a single metacarpophalangeal joint in an indirect visual tracking task. Similar movements were executed under two different conditions, i.e. with high and low error gain. The purpose was to explore whether different precision demands were associated with different spindle firing rates. With high error gain, a small but significantly higher impulse rate was found in pooled data from Ia afferents during lengthening movements but not during shortening movements, nor with II afferents. EMG was also significantly higher with high error gain in recordings with Ia afferents. When the effect of EMG was factored out, using partial correlation analysis, the significant difference in Ia firing rate vanished. The findings suggest that fusimotor drive as well as skeletomotor activity were both marginally higher when the precision demand was higher, whereas no indication of independent fusimotor adjustments was found. These results are disc...Continue Reading

Citations

Dec 24, 2015·Frontiers in Human Neuroscience·Shinji KubotaKozo Funase
Nov 13, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Roger M EnokaJacques Duchateau
Aug 15, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Tadaaki ManoShinobu Toma
Jun 24, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Riccardo MazzocchioLeonardo G Cohen
Oct 16, 2004·Journal of Neurophysiology·Carol J MottramRoger M Enoka
Jul 16, 2005·Journal of Applied Physiology·Katrina S Maluf, Roger M Enoka
Apr 19, 2018·Journal of Neurophysiology·Vaughan G Macefield, Thomas P Knellwolf

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