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    Engagement of the contralateral limb can enhance the facilitation of motor output by loud acoustic stimuli

    91316.pdf (1.891Mb)
    Access Status
    Open access
    Authors
    McInnes, Aaron Nicholas
    Nguyen, An
    Carroll, T.J.
    Lipp, Ottmar
    Marinovic, Welber
    Date
    2022
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    McInnes, A.N. and Nguyen, A.T. and Carroll, T.J. and Lipp, O.V. and Marinovic, W. 2022. Engagement of the contralateral limb can enhance the facilitation of motor output by loud acoustic stimuli. Journal of Neurophysiology. 127 (4): pp. 840-855.
    Source Title
    Journal of Neurophysiology
    DOI
    10.1152/jn.00235.2021
    ISSN
    0022-3077
    Faculty
    Faculty of Health Sciences
    School
    Curtin School of Population Health
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180100394
    URI
    http://hdl.handle.net/20.500.11937/91492
    Collection
    • Curtin Research Publications
    Abstract

    When intense sound is presented during light muscle contraction, inhibition of the corticomotoneuronal pathway is observed. During action preparation, this effect is reversed, with sound resulting in excitation of the corticomotoneuronal pathway. We investigated how the combined maintenance of a muscle contraction during preparation for a ballistic action impacts the magnitude of the facilitation of motor output by a loud acoustic stimulus (LAS), a phenomenon known as the StartReact effect. Participants executed ballistic wrist flexion movements and a LAS was presented simultaneously with the imperative signal in a subset of trials. We examined whether the force level or muscle used to maintain a contraction during preparation for the ballistic response impacted reaction time and/or the force of movements triggered by the LAS. These contractions were sustained either ipsilaterally or contralaterally to the ballistic response. The magnitude of facilitation by the LAS was greatest when low-force flexion contractions were maintained in the limb contralateral to the ballistic response during preparation. There was little change in facilitation when contractions recruited the contralateral extensor muscle or when they were sustained in the same limb that executed the ballistic response. We conclude that a larger network of neurons that may be engaged by a contralateral sustained contraction prior to initiation may be recruited by the LAS, further contributing to the motor output of the response. These findings may be particularly applicable in stroke rehabilitation, where engagement of the contralesional side may increase the benefits of a LAS to the functional recovery of movement.

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