Magnification of visual feedback modulates corticomuscular and intermuscular coherences differently in young and elderly adults
Magnification of visual feedback modulates corticomuscular and intermuscular coherences differently in young and elderly adults
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DOI：
10.1016/j.neuroimage.2020.117089
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发表时间：
2020-06
期刊：
影响因子：
5.7
通讯作者：
Tatsunori Watanabe;I. Nojima;T. Mima;H. Sugiura;H. Kirimoto
中科院分区：
文献类型：
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作者：
Tatsunori Watanabe;I. Nojima;T. Mima;H. Sugiura;H. Kirimoto
β波段（15-30赫兹）皮质肌肉和肌肉间的一致性是皮质脊髓相互作用的重要标志。本研究的目的是探讨在等距握力收缩过程中视觉反馈的数量是否会影响年轻人和老年人的这些一致性。33名健康青年和老年人用右手拇指和食指进行捏握力匹配任务，同时记录头皮第一背骨间肌（FDI）和短拇外展肌（APB）的脑电图（EEG）和肌电（EMG）。通过操纵视觉增益（低和高）来改变视觉反馈的量。在感觉运动皮层的脑电图和FDI肌的肌电图以及APB肌的脑电图和肌电图之间计算β带皮质肌肉相干性（EEG-FDI和EEG-APB相干性）。此外，还计算了FDI和APB肌电信号之间的肌间相干性（肌电-肌电相干性）。任务绩效量化为力的标准偏差（SD）和平均力误差（MFE）。老年受试者在高视觉增益时EEG-FDI一致性大于低视觉增益时的一致性，而在年轻受试者中则没有，而年龄和视觉增益对EEG-APB一致性没有影响。年轻和老年受试者在高视觉增益时肌电-肌电相干性小于低视觉增益时。青年和老年被试的MFE在高视力增益时小于低视力增益，而力的SD在高视力增益时小于低视力增益时仅在青年被试中存在。这些结果表明，衰老对-带相干性的影响取决于视觉反馈的量，并且视觉反馈对-带皮质肌间相干性和肌间相干性的调节存在差异。
Beta-band (15–30 Hz) corticomuscular and intermuscular coherences are important markers of the corticospinal interaction. The purpose of this study was to investigate whether amount of visual feedback during an isometric pinch grip contraction would influence these coherences in young and elderly adults. Thirty-three healthy young and elderly subjects performed pinch grip force-matching task with right thumb and index finger, while scalp electroencephalogram (EEG) and electromyogram (EMG) from the first dorsal interosseous (FDI) and abductor pollicis brevis (APB) muscles were recorded. The amount of visual feedback was altered by manipulation of visual gain (low and high). Beta-band corticomuscular coherence was computed between EEG over the sensorimotor cortex and EMG from the FDI muscle and between EEG and EMG from the APB muscle (EEG-FDI and EEG-APB coherences). Also, beta-band intermuscular coherence was computed between EMG signals from the FDI and APB muscles (EMG-EMG coherence). Task performance was quantified as standard deviation (SD) of force and mean force error (MFE). EEG-FDI coherence was larger at high than low visual gain in the elderly but not in the young subjects, whereas there was no effect of age or visual gain on EEG-APB coherence. EMG-EMG coherence was smaller at high than low visual gain in the young and elderly subjects. The MFE was smaller at high than low visual gain in the young and elderly subjects, but the SD of force was smaller at high than low visual gain only in the young subjects. These results suggest that the effect of aging on beta-band coherence depends on the amount of visual feedback and further that visual feedback modulates beta-band corticomuscular and intermuscular coherences differently.