Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies

We addressed postural instability during stance with eyes closed (EC) on a compliant surface in healthy young people. Spectral analysis of the centre of foot pressure oscillations was used to identify the effects of haptic information (light-touch, EC-LT), or vision (eyes open, EO), or both (EO-LT)....

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Autores principales:	Stefania Sozzi, Antonio Nardone, Marco Schieppati
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	stance critical conditions body oscillation spectral analysis centre of foot pressure length and area of sway path Neurology. Diseases of the nervous system RC346-429
Acceso en línea:	https://doaj.org/article/fde8c02e76da430d95e4fd335b68436d
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spelling	oai:doaj.org-article:fde8c02e76da430d95e4fd335b68436d2021-11-22T06:42:50ZSpecific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies1664-229510.3389/fneur.2021.756984https://doaj.org/article/fde8c02e76da430d95e4fd335b68436d2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fneur.2021.756984/fullhttps://doaj.org/toc/1664-2295We addressed postural instability during stance with eyes closed (EC) on a compliant surface in healthy young people. Spectral analysis of the centre of foot pressure oscillations was used to identify the effects of haptic information (light-touch, EC-LT), or vision (eyes open, EO), or both (EO-LT). Spectral median frequency was strongly reduced by EO and EO-LT, while spectral amplitude was reduced by all “stabilising” sensory conditions. Reduction in spectrum level by EO mainly appeared in the high-frequency range. Reduction by LT was much larger than that induced by the vision in the low-frequency range, less so in the high-frequency range. Touch and vision together produced a fall in spectral amplitude across all windows, more so in anteroposterior (AP) direction. Lowermost frequencies contributed poorly to geometric measures (sway path and area) for all sensory conditions. The same subjects participated in control experiments on a solid base of support. Median frequency and amplitude of the spectrum and geometric measures were largely smaller when standing on solid than on foam base but poorly affected by the sensory conditions. Frequency analysis but not geometric measures allowed to disclose unique tuning of the postural control mode by haptic and visual information. During standing on foam, the vision did not reduce low-frequency oscillations, while touch diminished the entire spectrum, except for the medium-high frequencies, as if sway reduction by touch would rely on rapid balance corrections. The combination of frequency analysis with sensory conditions is a promising approach to explore altered postural mechanisms and prospective interventions in subjects with central or peripheral nervous system disorders.Stefania SozziAntonio NardoneMarco SchieppatiFrontiers Media S.A.articlestancecritical conditionsbody oscillationspectral analysiscentre of foot pressurelength and area of sway pathNeurology. Diseases of the nervous systemRC346-429ENFrontiers in Neurology, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	stance critical conditions body oscillation spectral analysis centre of foot pressure length and area of sway path Neurology. Diseases of the nervous system RC346-429
spellingShingle	stance critical conditions body oscillation spectral analysis centre of foot pressure length and area of sway path Neurology. Diseases of the nervous system RC346-429 Stefania Sozzi Antonio Nardone Marco Schieppati Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies
description	We addressed postural instability during stance with eyes closed (EC) on a compliant surface in healthy young people. Spectral analysis of the centre of foot pressure oscillations was used to identify the effects of haptic information (light-touch, EC-LT), or vision (eyes open, EO), or both (EO-LT). Spectral median frequency was strongly reduced by EO and EO-LT, while spectral amplitude was reduced by all “stabilising” sensory conditions. Reduction in spectrum level by EO mainly appeared in the high-frequency range. Reduction by LT was much larger than that induced by the vision in the low-frequency range, less so in the high-frequency range. Touch and vision together produced a fall in spectral amplitude across all windows, more so in anteroposterior (AP) direction. Lowermost frequencies contributed poorly to geometric measures (sway path and area) for all sensory conditions. The same subjects participated in control experiments on a solid base of support. Median frequency and amplitude of the spectrum and geometric measures were largely smaller when standing on solid than on foam base but poorly affected by the sensory conditions. Frequency analysis but not geometric measures allowed to disclose unique tuning of the postural control mode by haptic and visual information. During standing on foam, the vision did not reduce low-frequency oscillations, while touch diminished the entire spectrum, except for the medium-high frequencies, as if sway reduction by touch would rely on rapid balance corrections. The combination of frequency analysis with sensory conditions is a promising approach to explore altered postural mechanisms and prospective interventions in subjects with central or peripheral nervous system disorders.
format	article
author	Stefania Sozzi Antonio Nardone Marco Schieppati
author_facet	Stefania Sozzi Antonio Nardone Marco Schieppati
author_sort	Stefania Sozzi
title	Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies
title_short	Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies
title_full	Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies
title_fullStr	Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies
title_full_unstemmed	Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies
title_sort	specific posture-stabilising effects of vision and touch are revealed by distinct changes of body oscillation frequencies
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/fde8c02e76da430d95e4fd335b68436d
work_keys_str_mv	AT stefaniasozzi specificposturestabilisingeffectsofvisionandtoucharerevealedbydistinctchangesofbodyoscillationfrequencies AT antonionardone specificposturestabilisingeffectsofvisionandtoucharerevealedbydistinctchangesofbodyoscillationfrequencies AT marcoschieppati specificposturestabilisingeffectsofvisionandtoucharerevealedbydistinctchangesofbodyoscillationfrequencies
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Specific Posture-Stabilising Effects of Vision and Touch Are Revealed by Distinct Changes of Body Oscillation Frequencies

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