Cortical neuromagnetic activation accompanying two types of voluntary finger extension
Cortical neuromagnetic activation accompanying two types of voluntary finger extension
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DOI：
10.1016/j.brainres.2006.09.033
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发表时间：
2006-12-06
期刊：
影响因子：
2.9
通讯作者：
Kurokawa, Yukio
中科院分区：
文献类型：
--
作者：
Onishi, Hideaki;Soma, Toshio;Kurokawa, Yukio
我们检测了运动相关脑场（MRCF）波形的振幅和潜伏期，运动诱发场1 （MEF1）的产生和传入反馈，以及运动场神经磁活动和肌电图活动在两种自愿指数伸展运动中的关系。8名健康的右撇子男性志愿者参加了这项研究。每个受试者的实验包括记录两种手指运动后的MRCFs。其中一项（任务1）要求将右手食指主动伸出约40度。在第二项（任务2）中，将一根橡皮筋绑在右手食指上，产生的阻力约为与随意运动相关的肌电活动的1.5倍，使伸展到约40度。在两种任务中，运动场的峰值振幅和ECD力矩存在显著差异。在任务2中，从肌电开始到运动开始的机电延迟（77.8 +/- 16.2）比任务1（44.4 +/- 10.4）要长。然而，任务2从肌电图开始到MEF1峰值的潜伏期为87.6 +/- 8.5 ms，与任务1的潜伏期（88.6 +/- 8.5）无显著差异。MEF1的ECDs明显位于N20内侧、运动野外侧和后侧。这些发现表明MEF1的ECD位于3b区，但与N20区略有不同，并且这种MEF1成分的激活不是由于关节运动的开始，而是由于肌肉收缩的开始。(c) 2006 Elsevier B.V.版权所有
We examined the amplitude and latency of movement-related cerebral field (MRCF) waveforms, the generator and afferent feedback of movement-evoked field 1 (MEF1), and the relationship between motor field neuromagnetic activity and electromyo graphic activity during performance of two types of voluntary index extension. Eight healthy, right-handed male volunteers participated in this study. Experiments for each subject consisted of recording of MRCFs following two types of finger movement. One (Task 1) involved voluntary extension of the right index finger to about 40 degrees. In the second (Task 2), an elastic band was placed on the right index finger-tip, producing a resistance of about 1.5 times the electromyographic activity associated with the voluntary movement yielding extension to approximately 40 degrees. Peak amplitude and the ECD moment of the motor field differed significantly between the two tasks. In Task 2, the electromechanical delay from EMG onset to movement onset (77.8 +/- 16.2) was longer than in Task 1 (44.4 +/- 10.4). However, the latency from EMG onset to MEF1 peak was 87.6 +/- 8.5 ms in Task 2, and did not differ significantly from that in Task 1 (88.6 +/- 8.5). The ECDs of MEF1 were located significantly medial to N20 in and lateral and posterior to the motor field. These findings suggest that the ECD of MEF1 is located in area 3b, but is slightly different from N20 in, and that this MEF1 component activation is due not to the onset of joint movement but to that of muscular contraction. (c) 2006 Elsevier B.V. All rights reserved.