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Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states

The neural control of transition between posture and movement encompasses the regulation of reflex-stabilizing mechanisms to enable motion. Optimal feedback theory suggests that such transitions require the disengagement of one motor control policy before the implementation of another. To test this...

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Autores principales: Tisserand, Romain, Dakin, Christopher J, Van der Loos, Machiel HF, Croft, Elizabeth A, Inglis, Timothy J, Blouin, Jean-Sébastien
Formato: Online Artículo Texto
Lenguaje:English
Publicado: eLife Sciences Publications, Ltd 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6056236/
https://www.ncbi.nlm.nih.gov/pubmed/29989550
http://dx.doi.org/10.7554/eLife.36123
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author Tisserand, Romain
Dakin, Christopher J
Van der Loos, Machiel HF
Croft, Elizabeth A
Inglis, Timothy J
Blouin, Jean-Sébastien
author_facet Tisserand, Romain
Dakin, Christopher J
Van der Loos, Machiel HF
Croft, Elizabeth A
Inglis, Timothy J
Blouin, Jean-Sébastien
author_sort Tisserand, Romain
collection PubMed
description The neural control of transition between posture and movement encompasses the regulation of reflex-stabilizing mechanisms to enable motion. Optimal feedback theory suggests that such transitions require the disengagement of one motor control policy before the implementation of another. To test this possibility, we investigated the continuity of the vestibular control of balance during transitions between quiet standing and locomotion and between two standing postures. Healthy subjects initiated and terminated locomotion or shifted the distribution of their weight between their feet, while exposed to electrical vestibular stimuli (EVS). The relationship between EVS and ground reaction forces was quantified using time-frequency analyses. Discontinuities corresponding to null coherence periods were observed preceding the onset of movement initiation and during the step preceding locomotion termination. These results show humans interrupt the vestibular balance stabilizing mechanisms to transition between motor states, suggesting a discrete change between motor control policies, as predicted by optimal feedback theory.
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spelling pubmed-60562362018-07-25 Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states Tisserand, Romain Dakin, Christopher J Van der Loos, Machiel HF Croft, Elizabeth A Inglis, Timothy J Blouin, Jean-Sébastien eLife Human Biology and Medicine The neural control of transition between posture and movement encompasses the regulation of reflex-stabilizing mechanisms to enable motion. Optimal feedback theory suggests that such transitions require the disengagement of one motor control policy before the implementation of another. To test this possibility, we investigated the continuity of the vestibular control of balance during transitions between quiet standing and locomotion and between two standing postures. Healthy subjects initiated and terminated locomotion or shifted the distribution of their weight between their feet, while exposed to electrical vestibular stimuli (EVS). The relationship between EVS and ground reaction forces was quantified using time-frequency analyses. Discontinuities corresponding to null coherence periods were observed preceding the onset of movement initiation and during the step preceding locomotion termination. These results show humans interrupt the vestibular balance stabilizing mechanisms to transition between motor states, suggesting a discrete change between motor control policies, as predicted by optimal feedback theory. eLife Sciences Publications, Ltd 2018-07-10 /pmc/articles/PMC6056236/ /pubmed/29989550 http://dx.doi.org/10.7554/eLife.36123 Text en © 2018, Tisserand et al http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Human Biology and Medicine
Tisserand, Romain
Dakin, Christopher J
Van der Loos, Machiel HF
Croft, Elizabeth A
Inglis, Timothy J
Blouin, Jean-Sébastien
Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
title Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
title_full Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
title_fullStr Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
title_full_unstemmed Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
title_short Down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
title_sort down regulation of vestibular balance stabilizing mechanisms to enable transition between motor states
topic Human Biology and Medicine
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6056236/
https://www.ncbi.nlm.nih.gov/pubmed/29989550
http://dx.doi.org/10.7554/eLife.36123
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