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Effects of visually simulated roll motion on vection and postural stabilization

BACKGROUND: Visual motion often provokes vection (the induced perception of self-motion) and postural movement. Postural movement is known to increase during vection, suggesting the same visual motion signal underlies vection and postural control. However, self-motion does not need to be consciously...

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Autores principales: Tanahashi, Shigehito, Ujike, Hiroyasu, Kozawa, Ryo, Ukai, Kazuhiko
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2007
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2169230/
https://www.ncbi.nlm.nih.gov/pubmed/17922922
http://dx.doi.org/10.1186/1743-0003-4-39
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author Tanahashi, Shigehito
Ujike, Hiroyasu
Kozawa, Ryo
Ukai, Kazuhiko
author_facet Tanahashi, Shigehito
Ujike, Hiroyasu
Kozawa, Ryo
Ukai, Kazuhiko
author_sort Tanahashi, Shigehito
collection PubMed
description BACKGROUND: Visual motion often provokes vection (the induced perception of self-motion) and postural movement. Postural movement is known to increase during vection, suggesting the same visual motion signal underlies vection and postural control. However, self-motion does not need to be consciously perceived to influence postural control. Therefore, visual motion itself may affect postural control mechanisms. The purpose of the present study was to investigate the effects of visual motion and vection on postural movements during and after exposure to a visual stimulus motion. METHODS: Eighteen observers completed four experimental conditions, the order of which was counterbalanced across observers. Conditions corresponded to the four possible combinations of rotation direction of the visually simulated roll motion stimulus and the two different visual stimulus patterns. The velocity of the roll motion was held constant in all conditions at 60 deg/s. Observers assumed the standard Romberg stance, and postural movements were measured using a force platform and a head position sensor affixed to a helmet they wore. Observers pressed a button when they perceived vection. Postural responses and psychophysical parameters related to vection were analyzed. RESULTS: During exposure to the moving stimulus, body sway and head position of all observers moved in the same direction as the stimulus. Moreover, they deviated more during vection perception than no-vection-perception, and during no-vection-perception than no-visual-stimulus-motion. The postural movements also fluctuated more during vection-perception than no-vection-perception, and during no-vection-perception than no-visual-stimulus-motion, both in the left/right and anterior/posterior directions. There was no clear habituation for vection and posture, and no effect of stimulus type. CONCLUSION: Our results suggested that visual stimulus motion itself affects postural control, and supported the idea that the same visual motion signal is used for vection and postural control. We speculated that the mechanisms underlying the processing of visual motion signals for postural control and vection perception operate using different thresholds, and that a frame of reference for body orientation perception changed along with vection perception induced further increment of postural sway.
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spelling pubmed-21692302007-12-29 Effects of visually simulated roll motion on vection and postural stabilization Tanahashi, Shigehito Ujike, Hiroyasu Kozawa, Ryo Ukai, Kazuhiko J Neuroeng Rehabil Research BACKGROUND: Visual motion often provokes vection (the induced perception of self-motion) and postural movement. Postural movement is known to increase during vection, suggesting the same visual motion signal underlies vection and postural control. However, self-motion does not need to be consciously perceived to influence postural control. Therefore, visual motion itself may affect postural control mechanisms. The purpose of the present study was to investigate the effects of visual motion and vection on postural movements during and after exposure to a visual stimulus motion. METHODS: Eighteen observers completed four experimental conditions, the order of which was counterbalanced across observers. Conditions corresponded to the four possible combinations of rotation direction of the visually simulated roll motion stimulus and the two different visual stimulus patterns. The velocity of the roll motion was held constant in all conditions at 60 deg/s. Observers assumed the standard Romberg stance, and postural movements were measured using a force platform and a head position sensor affixed to a helmet they wore. Observers pressed a button when they perceived vection. Postural responses and psychophysical parameters related to vection were analyzed. RESULTS: During exposure to the moving stimulus, body sway and head position of all observers moved in the same direction as the stimulus. Moreover, they deviated more during vection perception than no-vection-perception, and during no-vection-perception than no-visual-stimulus-motion. The postural movements also fluctuated more during vection-perception than no-vection-perception, and during no-vection-perception than no-visual-stimulus-motion, both in the left/right and anterior/posterior directions. There was no clear habituation for vection and posture, and no effect of stimulus type. CONCLUSION: Our results suggested that visual stimulus motion itself affects postural control, and supported the idea that the same visual motion signal is used for vection and postural control. We speculated that the mechanisms underlying the processing of visual motion signals for postural control and vection perception operate using different thresholds, and that a frame of reference for body orientation perception changed along with vection perception induced further increment of postural sway. BioMed Central 2007-10-09 /pmc/articles/PMC2169230/ /pubmed/17922922 http://dx.doi.org/10.1186/1743-0003-4-39 Text en Copyright © 2007 Tanahashi et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Tanahashi, Shigehito
Ujike, Hiroyasu
Kozawa, Ryo
Ukai, Kazuhiko
Effects of visually simulated roll motion on vection and postural stabilization
title Effects of visually simulated roll motion on vection and postural stabilization
title_full Effects of visually simulated roll motion on vection and postural stabilization
title_fullStr Effects of visually simulated roll motion on vection and postural stabilization
title_full_unstemmed Effects of visually simulated roll motion on vection and postural stabilization
title_short Effects of visually simulated roll motion on vection and postural stabilization
title_sort effects of visually simulated roll motion on vection and postural stabilization
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2169230/
https://www.ncbi.nlm.nih.gov/pubmed/17922922
http://dx.doi.org/10.1186/1743-0003-4-39
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