Induced Suppression of the Left Dorsolateral Prefrontal Cortex Favorably Changes Interhemispheric Communication During Bimanual Coordination in Older Adults–A Neuronavigated rTMS Study

Frontiers in Aging Neuroscience

Hakuei Fujiyama¹  Julie Duque²  Stephan P. Swinnen³  Koen Cuypers⁴  Raf L. J. Meesen⁴  Oron Levin⁴  Kim van Dun⁵  Stefanie Verstraelen⁵ 

[1] Discipline of Psychology, Exercise Science, Chiropractic and Counselling College of Science, Health, Engineering and Education, Murdoch University, Murdoch, WA, Australia;Institute of Neuroscience, Université Catholique de Louvain, Louvain-la-Neuve, Belgium;Leuven Brain Institute (LBI), KU Leuven, Leuven, Belgium;Movement Control and Neuroplasticity Research Group, Department of Movement Sciences, Group Biomedical Sciences, KU Leuven, Leuven, Belgium;Neuroplasticity and Movement Control Research Group, Rehabilitation Research Institute (REVAL), Hasselt University, Diepenbeek, Belgium;

关键词: aging;    bimanual coordination;    dorsolateral prefrontal cortex;    interhemispheric interaction;    repetitive transcranial magnetic stimulation;   

DOI  :  10.3389/fnagi.2020.00149

来源: DOAJ

【 摘 要 】

Recent transcranial magnetic stimulation (TMS) research indicated that the ability of the dorsolateral prefrontal cortex (DLPFC) to disinhibit the contralateral primary motor cortex (M1) during motor preparation is an important predictor for bimanual motor performance in both young and older healthy adults. However, this DLPFC-M1 disinhibition is reduced in older adults. Here, we transiently suppressed left DLPFC using repetitive TMS (rTMS) during a cyclical bimanual task and investigated the effect of left DLPFC suppression: (1) on the projection from left DLPFC to the contralateral M1; and (2) on motor performance in 21 young (mean age ± SD = 21.57 ± 1.83) and 20 older (mean age ± SD = 69.05 ± 4.48) healthy adults. As predicted, without rTMS, older adults showed compromised DLPFC-M1 disinhibition as compared to younger adults and less preparatory DLPFC-M1 disinhibition was related to less accurate performance, irrespective of age. Notably, rTMS-induced DLPFC suppression restored DLPFC-M1 disinhibition in older adults and improved performance accuracy right after the local suppression in both age groups. However, the rTMS-induced gain in disinhibition was not correlated with the gain in performance. In sum, this novel rTMS approach advanced our mechanistic understanding of how left DLPFC regulates right M1 and allowed us to establish the causal role of left DLPFC in bimanual coordination.

【 授权许可】

Unknown