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    Supplementary motor area—primary motor cortex facilitation in younger but not older adults

    Access Status
    Fulltext not available
    Authors
    Green, P.
    Ridding, M.
    Hill, Keith
    Semmler, J.
    Drummond, P.
    Vallence, A.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Green, P. and Ridding, M. and Hill, K. and Semmler, J. and Drummond, P. and Vallence, A. 2018. Supplementary motor area—primary motor cortex facilitation in younger but not older adults. Neurobiology of Aging. 64: pp. 85-91.
    Source Title
    Neurobiology of Aging
    DOI
    10.1016/j.neurobiolaging.2017.12.016
    ISSN
    0197-4580
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/65639
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier Inc. Growing evidence implicates a decline in white matter integrity in the age-related decline in motor control. Functional neuroimaging studies show significant associations between functional connectivity in the cortical motor network, including the supplementary motor area (SMA), and motor performance. Dual-coil transcranial magnetic stimulation studies show facilitatory connections between SMA and the primary motor cortex (M1) in younger adults. Here, we investigated whether SMA-M1 facilitation is affected by age and whether the strength of SMA-M1 facilitation is associated with bilateral motor control. Dual-coil transcranial magnetic stimulation was used to measure SMA-M1 connectivity in younger (N = 20) and older adults (N = 18), and bilateral motor control was measured with the assembly subtest of the Purdue Pegboard and clinical measures of dynamic balance. SMA-M1 facilitation was seen in younger but not older adults, and a significant positive association was found between SMA-M1 facilitation and bimanual performance. These results show that SMA-M1 facilitation is reduced in older adults compared to younger adults and provide evidence of the functional importance of SMA-M1 facilitation.

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