Abstract
It is commonly accepted that the brains capacity to change, known as plasticity, declines into old age. Recent studies have used a variety of non-invasive brain stimulation (NIBS) techniques to examine this age-related decline in plasticity in the primary motor cortex (M1), but the effects seem inconsistent and difficult to unravel. The purpose of this review is to provide an update on studies that have used different NIBS techniques to assess M1 plasticity with advancing age and offer some new perspective on NIBS strategies to boost plasticity in the ageing brain. We find that early studies show clear differences in M1 plasticity between young and older adults, but many recent studies with motor training show no decline in use-dependent M1 plasticity with age. For NIBS-induced plasticity in M1, some protocols show more convincing differences with advancing age than others. Therefore, our view from the NIBS literature is that it should not be automatically assumed that M1 plasticity declines with age. Instead, the effects of age are likely to depend on how M1 plasticity is measured, and the characteristics of the elderly population tested. We also suggest that NIBS performed concurrently with motor training is likely to be most effective at producing improvements in M1 plasticity and motor skill learning in older adults. Proposed NIBS techniques for future studies include combining multiple NIBS protocols in a co-stimulation approach, or NIBS strategies to modulate intracortical inhibitory mechanisms, in an effort to more effectively boost M1 plasticity and improve motor skill learning in older adults.
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Acknowledgements
Funding for the ageing studies from this laboratory have been provided from the Australian Research Council Discovery Projects Grant scheme (Grant numbers DP150100930, DP200101009). RS was supported by a Uehara Memorial Foundation (Grant number 201830079. BJH is supported by an Australian Government Research Training Program Scholarship. GMO is supported by a National Health and Medical Research Council early career fellowship (APP1139723). The study sponsor had no involvement in the collection, analysis and interpretation of the data, or the writing of the manuscript.
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Semmler, J.G., Hand, B.J., Sasaki, R. et al. Age-related changes in motor cortex plasticity assessed with non-invasive brain stimulation: an update and new perspectives. Exp Brain Res 239, 2661–2678 (2021). https://doi.org/10.1007/s00221-021-06163-z
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DOI: https://doi.org/10.1007/s00221-021-06163-z