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Aging differentially affects online control and offline control in finger force production

Human central nervous system (CNS) undergoes neurological changes during the aging process, leading to declines in hand and finger functions. Previous studies have shown that the CNS can independently process multi-finger force control and moment of force control. However, if both force and moment c...

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Autores principales: Park, Yang Sun, Koh, Kyung, Kwon, Hyun Joon, Lee, Okjin, Shim, Jae Kun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978793/
https://www.ncbi.nlm.nih.gov/pubmed/29851967
http://dx.doi.org/10.1371/journal.pone.0198084
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author Park, Yang Sun
Koh, Kyung
Kwon, Hyun Joon
Lee, Okjin
Shim, Jae Kun
author_facet Park, Yang Sun
Koh, Kyung
Kwon, Hyun Joon
Lee, Okjin
Shim, Jae Kun
author_sort Park, Yang Sun
collection PubMed
description Human central nervous system (CNS) undergoes neurological changes during the aging process, leading to declines in hand and finger functions. Previous studies have shown that the CNS can independently process multi-finger force control and moment of force control. However, if both force and moment control are simultaneously imposed by motor task constraints, the CNS needs to resolve competing interests of generating negative and positive covariances between fingers, respectively, which causes “conflict of interest or COI”. Here, we investigated how aging affects the CNS’s abilities to solve COI through a new experimental paradigm. Both elderly and young subjects performed a constant force production task using index and middle fingers under two conditions, multi-finger pressing with no COI and with COI. We found that the elderly increased variance of a virtual finger (VF: an imagined finger producing the same mechanical effect as both fingers together) in time-to-time basis (i.e. online control), while increasing covariance between individual fingers (IF) forces in trial-to-trial basis (i.e. offline control) with COI than no COI. Aging affects the CNS’s abilities to solve COI by deteriorating VF actions in online control and IF actions in offline control.
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spelling pubmed-59787932018-06-17 Aging differentially affects online control and offline control in finger force production Park, Yang Sun Koh, Kyung Kwon, Hyun Joon Lee, Okjin Shim, Jae Kun PLoS One Research Article Human central nervous system (CNS) undergoes neurological changes during the aging process, leading to declines in hand and finger functions. Previous studies have shown that the CNS can independently process multi-finger force control and moment of force control. However, if both force and moment control are simultaneously imposed by motor task constraints, the CNS needs to resolve competing interests of generating negative and positive covariances between fingers, respectively, which causes “conflict of interest or COI”. Here, we investigated how aging affects the CNS’s abilities to solve COI through a new experimental paradigm. Both elderly and young subjects performed a constant force production task using index and middle fingers under two conditions, multi-finger pressing with no COI and with COI. We found that the elderly increased variance of a virtual finger (VF: an imagined finger producing the same mechanical effect as both fingers together) in time-to-time basis (i.e. online control), while increasing covariance between individual fingers (IF) forces in trial-to-trial basis (i.e. offline control) with COI than no COI. Aging affects the CNS’s abilities to solve COI by deteriorating VF actions in online control and IF actions in offline control. Public Library of Science 2018-05-31 /pmc/articles/PMC5978793/ /pubmed/29851967 http://dx.doi.org/10.1371/journal.pone.0198084 Text en © 2018 Park et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Park, Yang Sun
Koh, Kyung
Kwon, Hyun Joon
Lee, Okjin
Shim, Jae Kun
Aging differentially affects online control and offline control in finger force production
title Aging differentially affects online control and offline control in finger force production
title_full Aging differentially affects online control and offline control in finger force production
title_fullStr Aging differentially affects online control and offline control in finger force production
title_full_unstemmed Aging differentially affects online control and offline control in finger force production
title_short Aging differentially affects online control and offline control in finger force production
title_sort aging differentially affects online control and offline control in finger force production
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978793/
https://www.ncbi.nlm.nih.gov/pubmed/29851967
http://dx.doi.org/10.1371/journal.pone.0198084
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