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Inter-trial phase coherence of visually evoked postural responses in virtual reality
Vision plays a central role in maintaining balance. When humans perceive their body as moving, they trigger counter movements. This results in body sway, which has typically been investigated by measuring the body’s center of pressure (COP). Here, we aimed to induce visually evoked postural response...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7237531/ https://www.ncbi.nlm.nih.gov/pubmed/32239245 http://dx.doi.org/10.1007/s00221-020-05782-2 |
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author | Engel, David Schütz, Adrian Krala, Milosz Schwenk, Jakob C. B. Morris, Adam P. Bremmer, Frank |
author_facet | Engel, David Schütz, Adrian Krala, Milosz Schwenk, Jakob C. B. Morris, Adam P. Bremmer, Frank |
author_sort | Engel, David |
collection | PubMed |
description | Vision plays a central role in maintaining balance. When humans perceive their body as moving, they trigger counter movements. This results in body sway, which has typically been investigated by measuring the body’s center of pressure (COP). Here, we aimed to induce visually evoked postural responses (VEPR) by simulating self-motion in virtual reality (VR) using a sinusoidally oscillating “moving room” paradigm. Ten healthy subjects participated in the experiment. Stimulation consisted of a 3D-cloud of random dots, presented through a VR headset, which oscillated sinusoidally in the anterior–posterior direction at different frequencies. We used a force platform to measure subjects’ COP over time and quantified the resulting trajectory by wavelet analyses including inter-trial phase coherence (ITPC). Subjects exhibited significant coupling of their COP to the respective stimulus. Even when spectral analysis of postural sway showed only small responses in the expected frequency bands (power), ITPC revealed an almost constant strength of coupling to the stimulus within but also across subjects and presented frequencies. Remarkably, ITPC even revealed a strong phase coupling to stimulation at 1.5 Hz, which exceeds the frequency range that has generally been attributed to the coupling of human postural sway to an oscillatory visual scenery. These findings suggest phase-locking to be an essential feature of visuomotor control. |
format | Online Article Text |
id | pubmed-7237531 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-72375312020-05-27 Inter-trial phase coherence of visually evoked postural responses in virtual reality Engel, David Schütz, Adrian Krala, Milosz Schwenk, Jakob C. B. Morris, Adam P. Bremmer, Frank Exp Brain Res Research Article Vision plays a central role in maintaining balance. When humans perceive their body as moving, they trigger counter movements. This results in body sway, which has typically been investigated by measuring the body’s center of pressure (COP). Here, we aimed to induce visually evoked postural responses (VEPR) by simulating self-motion in virtual reality (VR) using a sinusoidally oscillating “moving room” paradigm. Ten healthy subjects participated in the experiment. Stimulation consisted of a 3D-cloud of random dots, presented through a VR headset, which oscillated sinusoidally in the anterior–posterior direction at different frequencies. We used a force platform to measure subjects’ COP over time and quantified the resulting trajectory by wavelet analyses including inter-trial phase coherence (ITPC). Subjects exhibited significant coupling of their COP to the respective stimulus. Even when spectral analysis of postural sway showed only small responses in the expected frequency bands (power), ITPC revealed an almost constant strength of coupling to the stimulus within but also across subjects and presented frequencies. Remarkably, ITPC even revealed a strong phase coupling to stimulation at 1.5 Hz, which exceeds the frequency range that has generally been attributed to the coupling of human postural sway to an oscillatory visual scenery. These findings suggest phase-locking to be an essential feature of visuomotor control. Springer Berlin Heidelberg 2020-04-01 2020 /pmc/articles/PMC7237531/ /pubmed/32239245 http://dx.doi.org/10.1007/s00221-020-05782-2 Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Research Article Engel, David Schütz, Adrian Krala, Milosz Schwenk, Jakob C. B. Morris, Adam P. Bremmer, Frank Inter-trial phase coherence of visually evoked postural responses in virtual reality |
title | Inter-trial phase coherence of visually evoked postural responses in virtual reality |
title_full | Inter-trial phase coherence of visually evoked postural responses in virtual reality |
title_fullStr | Inter-trial phase coherence of visually evoked postural responses in virtual reality |
title_full_unstemmed | Inter-trial phase coherence of visually evoked postural responses in virtual reality |
title_short | Inter-trial phase coherence of visually evoked postural responses in virtual reality |
title_sort | inter-trial phase coherence of visually evoked postural responses in virtual reality |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7237531/ https://www.ncbi.nlm.nih.gov/pubmed/32239245 http://dx.doi.org/10.1007/s00221-020-05782-2 |
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