Asymmetric spatiotemporal patterns of event-related desynchronization preceding voluntary sequential finger movements: a high-resolution EEG study
Asymmetric spatiotemporal patterns of event-related desynchronization preceding voluntary sequential finger movements: a high-resolution EEG study
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DOI：
10.1016/j.clinph.2005.01.006
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发表时间：
2005-05-01
影响因子：
4.7
通讯作者：
Hallett, M
中科院分区：
文献类型：
--
作者：
Bai, O;Mari, Z;Hallett, M
目的：研究右手优势手和左手非优势手自发性手指顺序运动前事件相关失同步（ERD）的时空模式。方法：9名被试进行自定节奏的动作，由任意一只手的三个按键组成。受试者将运动的侧边度和时间随机化。记录122个通道的脑电图。无参考的β波段脑电功率测量值离线计算。结果：在运动准备期间（相对于运动开始的-2至-0.5 s），仅在右手手指运动中观察到对侧优势的事件相关去同步（ERD）（侧化功率），而左手手指运动中的ERD是双侧的。结论：对于右撇子，左手运动时左脑半球的激活大于右手运动时右脑半球的激活。意义：我们进一步证明了左半球在复杂的连续手指运动的运动准备早期的运动优势。由爱思唯尔爱尔兰有限公司代表国际临床神经生理学联合会出版。
Objective: To study spatiotemporal patterns of event-related desynchronization (ERD) preceding voluntary sequential finger movements performed with dominant right hand and nondominant left hand.Methods: Nine subjects performed self-paced movements consisting of three key strokes with either hand. Subjects randomized the laterality and timing of movements. Electroencephalogram (EEG) was recorded from 122 channels. Reference-free EEG power measurements in the beta band were calculated off-line.Results: During motor preparation (-2 to -0.5 s with respect to movement onset), contralateral preponderance of event-related desynchronization (ERD) (lateralized power) was only observed during right hand finger movements, whereas ERD during left hand finger movements was bilateral.Conclusions: For right-handers, activation on the left hemisphere during left hand movements is greater than that on the right hemisphere during right hand movements.Significance: We provide further evidence for motor dominance of the left hemisphere in early period of motor preparation for complex sequential finger movements. Published by Elsevier Ireland Ltd on behalf of International Federation of Clinical Neurophysiology.