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Title: | Considerable effects of lateralization and aging in intracortical excitation and inhibition | Authors: | Bai, ZF Zhu, FF Lou, XY Zhang, JJ Jin, MX Qin, WT Tang, CZ Li, J Lu, JN Lin, JH Jin, LJ Qi, Q Fong, KNK |
Issue Date: | 2023 | Source: | Frontiers in neuroscience, 2023, v. 17, 1269474 | Abstract: | Introduction: Findings based on the use of transcranial magnetic stimulation and electromyography (TMS-EMG) to determine the effects of motor lateralization and aging on intracortical excitation and inhibition in the primary motor cortex (M1) are inconsistent in the literature. TMS and electroencephalography (TMS-EEG) measures the excitability of excitatory and inhibitory circuits in the brain cortex without contamination from the spine and muscles. This study aimed to investigate the effects of motor lateralization (dominant and non-dominant hemispheres) and aging (young and older) and their interaction effects on intracortical excitation and inhibition within the M1 in healthy adults, measured using TMS-EMG and TMS-EEG.Methods: This study included 21 young (mean age = 28.1 +/- 3.2 years) and 21 older healthy adults (mean age = 62.8 +/- 4.2 years). A battery of TMS-EMG measurements and single-pulse TMS-EEG were recorded for the bilateral M1.Results: Two-way repeated-measures analysis of variance was used to investigate lateralization and aging and the lateralization-by-aging interaction effect on neurophysiological outcomes. The non-dominant M1 presented a longer cortical silent period and larger amplitudes of P60, N100, and P180. Corticospinal excitability in older participants was significantly reduced, as supported by a larger resting motor threshold and lower motor-evoked potential amplitudes. N100 amplitudes were significantly reduced in older participants, and the N100 and P180 latencies were significantly later than those in young participants. There was no significant lateralization-by-aging interaction effect in any outcome.Conclusion: Lateralization and aging have independent and significant effects on intracortical excitation and inhibition in healthy adults. The functional decline of excitatory and inhibitory circuits in the M1 is associated with aging. | Keywords: | Lateralization Aging TMS-EEG Motor-evoked potentials Intracortical inhibition |
Publisher: | Frontiers Research Foundation | Journal: | Frontiers in neuroscience | ISSN: | 1662-453X | DOI: | 10.3389/fnins.2023.1269474 | Rights: | © 2023 Bai, Zhu, Lou, Zhang, Jin, Qin, Tang, Li, Lu, Lin, Jin, Qi and Fong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (https://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. The following publication Bai Z, Zhu F, Lou X, Zhang JJ, Jin M, Qin W, Tang C, Li J, Lu J, Lin J, Jin L, Qi Q and Fong KNK (2023) Considerable effects of lateralization and aging in intracortical excitation and inhibition. Front. Neurosci. 17:1269474 is available at https://dx.doi.org/10.3389/fnins.2023.1269474. |
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