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

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    Author
    Park, Y.S.
    Koh, K.
    Kwon, H.J.
    Date
    2018
    Journal
    PLoS ONE
    Publisher
    Public Library of Science
    Type
    Article
    
    Metadata
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    See at
    https://dx.doi.org/10.1371/journal.pone.0198084
    Abstract
    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. Copyright 2018 Park et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
    Keyword
    Central nervous system--Aging
    Fingers
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85047939526&doi=10.1371%2fjournal.pone.0198084&partnerID=40&md5=276dd40d401abb16ba27cc56919d21cb; http://hdl.handle.net/10713/9085
    ae974a485f413a2113503eed53cd6c53
    10.1371/journal.pone.0198084
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