Time course of haptic stabilization of posture

Experimental Brain Research
Ely RabinJ R Lackner

Abstract

Contact of the index finger with a stable surface greatly attenuates postural sway in blindfolded subjects. The time course of postural stabilization was measured after subjects made finger contact with a surface. Subjects (n=12) were tested standing in a heel-to-toe stance in 25 s duration trials. The subject stood with the index finger above but not contacting a laterally placed surface, and made finger contact when cued midway through the trial. Fingertip contact forces stabilized with a time constant of less than 0.5 s and postural stabilization occurred rapidly following fingertip contact. Sway amplitude of center of pressure of the feet decreased by half with a time constant of less than 1.6 s. The stereotypical pattern of force changes at the fingertip leading correlated changes in center of pressure by approximately 300 ms was evident within the first 0.5 s of finger contact. We conclude that the fingertip can serve as a sensory-motor probe that is stabilized nearly immediately on contact with a surface and that from the moment of contact the fingertip contributes sensory signals used to control sway.

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Citations

Mar 3, 2010·Experimental Brain Research·Sébastien CaudronMichel Guerraz
Dec 18, 2013·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Marco SchieppatiStefania Sozzi
Nov 22, 2015·Parkinsonism & Related Disorders·Vladimir IvkovicWilliam H Paloski
Aug 21, 2015·Neuroscience Letters·Fu-Chen Chen, Chia-Liang Tsai
May 20, 2016·Journal of Physiological Anthropology·Kazushige Oshita, Sumio Yano
Aug 13, 2011·Human Factors·Jason D Moss, Eric R Muth
Aug 28, 2015·The Open Biomedical Engineering Journal·Kazushige Oshita, Sumio Yano
Feb 17, 2007·Journal of Neurophysiology·Leif JohannsenVassilia Hatzitaki
Oct 1, 2011·Journal of Neurophysiology·Leif JohannsenVassilia Hatzitaki
Jan 14, 2016·Experimental Brain Research·Tomoya IshigakiShu Morioka
Jun 1, 2021·Frontiers in Neurology·James R Lackner

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