Changes in power and coherence of brain activity in human sensorimotor cortex during performance of visuomotor tasks
Changes in power and coherence of brain activity in human sensorimotor cortex during performance of visuomotor tasks
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DOI：
10.1016/s0303-2647(01)00149-6
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发表时间：
2001-11-01
期刊：
影响因子：
1.6
通讯作者：
Ojemann, GA
中科院分区：
文献类型：
--
作者：
Aoki, F;Fetz, EE;Ojemann, GA
用硬膜下栅极记录了6名受试者前臂感觉运动皮质的皮层电活动。受试者完成了三项视觉运动任务：用操纵杆控制的光标跟踪移动的视觉目标；穿线管子；按顺序捏手指与拇指。控制条件为静息和主动伸腕。在手部和手臂感觉运动区的14个部位记录了ECoG，功能鉴定为电刺激。对于每种行为，我们计算了每个站点的ECoG的频谱功率和所有配对站点的相干性。六分之三的受试者在开始任务时观察到伽马振荡。在视觉运动任务的执行过程中，所有受试者都表现出在11-20赫兹范围内普遍的功率降低和在31-60赫兹范围内的功率增加。在跟踪和穿线任务中，与手腕伸展相比，伽马射程功率的变化更剧烈。连贯性分析也显示出与任务相关的连贯性估计的变化。与能量变化相反，在操纵性视觉运动任务中，相干性估计不仅在伽马范围内增加，而且在较低频率下也增加。相干性估计显著增加的配对部位位于感觉和运动区之内和之间。这些结果支持一个假设，即连贯的皮质活动可能在感觉运动整合或注意中发挥作用。(C)2001爱思唯尔爱尔兰科学有限公司。保留所有权利。
Electrocorticograms (ECoG) were recorded using subdural grid electrodes in forearm sensorimotor cortex of six human subjects. The subjects performed three visuomotor tasks, tracking a moving visual target with a joystick-controlled cursor; threading pieces of tubing; and pinching the fingers sequentially against the thumb. Control conditions were resting and active wrist extension. ECoGs were recorded at 14 sites in hand- and arm-sensorimotor area, functionally identified with electrical stimulation. For each behavior we computed spectral power of ECoG in each site and coherence in all pair-wise sites. In three out of six subjects, gamma-oscillations were observed when the subjects started the tasks. All subjects showed widespread power decrease in the range of 11-20 Hz and power increase in the 31-60 Hz ranges during performance of the visuomotor tasks. The changes in gamma-range power were more vigorous during the tracking and threading tasks compared with the wrist extension. Coherence analysis also showed similar task-related changes in coherence estimates. In contrast to the power changes, coherence estimates increased not only in gamma-range but also at lower frequencies during the manipulative visuomotor tasks. Paired sites with significant increases in coherence estimates were located within and between sensory and motor areas. These results support the hypothesis that coherent cortical activity may play a role in sensorimotor integration or attention. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.