No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults

Abstract Noisy galvanic vestibular stimulation (nGVS) at imperceptible levels has been shown to reduce body sway. This reduction was commonly attributed to the mechanism of stochastic resonance (SR). However, it has never been explicitly tested whether nGVS-induced effects on body sway consistently...

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Autores principales:	L. Assländer, L. S. Giboin, M. Gruber, R. Schniepp, M. Wuehr
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f7c855a7bc9f44379673c3c55c0e8706
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spelling	oai:doaj.org-article:f7c855a7bc9f44379673c3c55c0e87062021-12-02T17:47:37ZNo evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults10.1038/s41598-021-91808-w2045-2322https://doaj.org/article/f7c855a7bc9f44379673c3c55c0e87062021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91808-whttps://doaj.org/toc/2045-2322Abstract Noisy galvanic vestibular stimulation (nGVS) at imperceptible levels has been shown to reduce body sway. This reduction was commonly attributed to the mechanism of stochastic resonance (SR). However, it has never been explicitly tested whether nGVS-induced effects on body sway consistently follow a SR-like bell-shaped performance curve with maximal reductions in a particular range of noise intensities. To test this, body sway in 21 young healthy participants was measured during varying nGVS amplitudes while standing with eyes closed in 3 conditions (quiet stance, sway referencing, sinusoidal platform tilts). Presence of SR-like response dynamics in each trial was assessed (1) by a goodness-of-fit analysis using an established SR-curve model and (2) by ratings from 3 human experts. In accordance to theory, we found reductions of body sway at one nGVS amplitude in most trials (75–95%). However, only few trials exhibited SR-like bell-shaped performance curves with increasing noise amplitudes (10–33%). Instead, body sway measures rather fluctuated randomly across nGVS amplitudes. This implies that, at least in young healthy adults, nGVS effects on body sway are incompatible with SR. Thus, previously reported reductions of body sway at particular nGVS intensities more likely result from inherent variations of the performance metric or by other yet unknown mechanisms.L. AssländerL. S. GiboinM. GruberR. SchnieppM. WuehrNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Assländer L. S. Giboin M. Gruber R. Schniepp M. Wuehr No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
description	Abstract Noisy galvanic vestibular stimulation (nGVS) at imperceptible levels has been shown to reduce body sway. This reduction was commonly attributed to the mechanism of stochastic resonance (SR). However, it has never been explicitly tested whether nGVS-induced effects on body sway consistently follow a SR-like bell-shaped performance curve with maximal reductions in a particular range of noise intensities. To test this, body sway in 21 young healthy participants was measured during varying nGVS amplitudes while standing with eyes closed in 3 conditions (quiet stance, sway referencing, sinusoidal platform tilts). Presence of SR-like response dynamics in each trial was assessed (1) by a goodness-of-fit analysis using an established SR-curve model and (2) by ratings from 3 human experts. In accordance to theory, we found reductions of body sway at one nGVS amplitude in most trials (75–95%). However, only few trials exhibited SR-like bell-shaped performance curves with increasing noise amplitudes (10–33%). Instead, body sway measures rather fluctuated randomly across nGVS amplitudes. This implies that, at least in young healthy adults, nGVS effects on body sway are incompatible with SR. Thus, previously reported reductions of body sway at particular nGVS intensities more likely result from inherent variations of the performance metric or by other yet unknown mechanisms.
format	article
author	L. Assländer L. S. Giboin M. Gruber R. Schniepp M. Wuehr
author_facet	L. Assländer L. S. Giboin M. Gruber R. Schniepp M. Wuehr
author_sort	L. Assländer
title	No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
title_short	No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
title_full	No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
title_fullStr	No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
title_full_unstemmed	No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
title_sort	no evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f7c855a7bc9f44379673c3c55c0e8706
work_keys_str_mv	AT lasslander noevidenceforstochasticresonanceeffectsonstandingbalancewhenapplyingnoisygalvanicvestibularstimulationinyounghealthyadults AT lsgiboin noevidenceforstochasticresonanceeffectsonstandingbalancewhenapplyingnoisygalvanicvestibularstimulationinyounghealthyadults AT mgruber noevidenceforstochasticresonanceeffectsonstandingbalancewhenapplyingnoisygalvanicvestibularstimulationinyounghealthyadults AT rschniepp noevidenceforstochasticresonanceeffectsonstandingbalancewhenapplyingnoisygalvanicvestibularstimulationinyounghealthyadults AT mwuehr noevidenceforstochasticresonanceeffectsonstandingbalancewhenapplyingnoisygalvanicvestibularstimulationinyounghealthyadults
_version_	1718379504850698240

No evidence for stochastic resonance effects on standing balance when applying noisy galvanic vestibular stimulation in young healthy adults

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