Down Regulation of Vestibular Balance Stabilizing Mechanisms to Enable Transition Between Motor States

Overview

Journal Elife

Specialty Biology

Date 2018 Jul 11

PMID 29989550

Citations 12

Authors

Romain Tisserand

Christopher J Dakin

Machiel Hf Van der Loos

Elizabeth A Croft

Timothy J Inglis

Jean-Sebastien Blouin

Affiliations

Soon will be listed here.

Abstract

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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