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Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations

We have previously shown that, with the hands apart vertically, passively grasping an artificial finger induces a sense of ownership over the artificial finger and coming-together of the hands. The present study investigated this grasp illusion in the horizontal plane. Thirty healthy participants we...

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Autores principales: Qureshi, Hassan G., Butler, Annie A., Kerr, Graham K., Gandevia, Simon C., Héroux, Martin E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6286308/
https://www.ncbi.nlm.nih.gov/pubmed/30531927
http://dx.doi.org/10.1038/s41598-018-35895-2
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author Qureshi, Hassan G.
Butler, Annie A.
Kerr, Graham K.
Gandevia, Simon C.
Héroux, Martin E.
author_facet Qureshi, Hassan G.
Butler, Annie A.
Kerr, Graham K.
Gandevia, Simon C.
Héroux, Martin E.
author_sort Qureshi, Hassan G.
collection PubMed
description We have previously shown that, with the hands apart vertically, passively grasping an artificial finger induces a sense of ownership over the artificial finger and coming-together of the hands. The present study investigated this grasp illusion in the horizontal plane. Thirty healthy participants were tested in two conditions (grasp and no grasp) with their hands at different distances apart, either crossed or uncrossed. After 3 min, participants reported perceived spacing between index fingers, perceived index finger location, and, for the grasp condition, perceived ownership over the artificial finger. On average, there was no ownership at any of the hand configurations. With the hands uncrossed 7.5, 15 or 24 cm apart, there was no difference in perceived spacing between the grasp and no grasp conditions. With the hands crossed and 15 cm apart, perceived spacing between index fingers was 3.2 cm [0.7 to 5.7] (mean [95% CI]) smaller during the grasp condition compared to no grasp. Therefore, compared to when the hands are vertically separated, there is an almost complete lack of a grasp illusion in the horizontal plane which indicates the brain may process sensory inputs from the hands differently based on whether the hands are horizontally or vertically apart.
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spelling pubmed-62863082018-12-19 Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations Qureshi, Hassan G. Butler, Annie A. Kerr, Graham K. Gandevia, Simon C. Héroux, Martin E. Sci Rep Article We have previously shown that, with the hands apart vertically, passively grasping an artificial finger induces a sense of ownership over the artificial finger and coming-together of the hands. The present study investigated this grasp illusion in the horizontal plane. Thirty healthy participants were tested in two conditions (grasp and no grasp) with their hands at different distances apart, either crossed or uncrossed. After 3 min, participants reported perceived spacing between index fingers, perceived index finger location, and, for the grasp condition, perceived ownership over the artificial finger. On average, there was no ownership at any of the hand configurations. With the hands uncrossed 7.5, 15 or 24 cm apart, there was no difference in perceived spacing between the grasp and no grasp conditions. With the hands crossed and 15 cm apart, perceived spacing between index fingers was 3.2 cm [0.7 to 5.7] (mean [95% CI]) smaller during the grasp condition compared to no grasp. Therefore, compared to when the hands are vertically separated, there is an almost complete lack of a grasp illusion in the horizontal plane which indicates the brain may process sensory inputs from the hands differently based on whether the hands are horizontally or vertically apart. Nature Publishing Group UK 2018-12-07 /pmc/articles/PMC6286308/ /pubmed/30531927 http://dx.doi.org/10.1038/s41598-018-35895-2 Text en © The Author(s) 2018 Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Qureshi, Hassan G.
Butler, Annie A.
Kerr, Graham K.
Gandevia, Simon C.
Héroux, Martin E.
Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations
title Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations
title_full Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations
title_fullStr Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations
title_full_unstemmed Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations
title_short Effects of horizontal distance and limb crossing on perceived hand spacing and ownership: Differential sensory processing across hand configurations
title_sort effects of horizontal distance and limb crossing on perceived hand spacing and ownership: differential sensory processing across hand configurations
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6286308/
https://www.ncbi.nlm.nih.gov/pubmed/30531927
http://dx.doi.org/10.1038/s41598-018-35895-2
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