The dynamics of sensorimotor cortical oscillations during the observation of hand movements: an EEG study.
The dynamics of sensorimotor cortical oscillations during the observation of hand movements: an EEG study.
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DOI：
10.1371/journal.pone.0037534
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Cantalupo G
中科院分区：
文献类型：
--
作者：
Avanzini P;Fabbri-Destro M;Dalla Volta R;Daprati E;Rizzolatti G;Cantalupo G
对他人行为的观察决定了从皮层中心区域记录的节奏的不同步。在这里，我们研究了观察不同类型的手部运动（目标定向、非目标定向、循环和非循环）是否会引起不同的脑电图皮层时间模式。研究人员向右撇子健康的参与者播放了四种手部运动的视频片段。两种是目标导向动作（抓握和指向）；两个是非目标导向的（旋后和握紧）动作。抓、旋1次，指、握紧2次（循环运动）。采用小波变换对高密度脑电图进行记录和分析，将时间过程细分到200ms的时间仓内。对所有呈现的运动的观察产生了中央和顶叶区域α和β节律的不同步。一旦手部运动开始，节奏就会失去同步，在运动开始后700毫秒左右达到最低点。在运动结束时，所有波段都出现了较大的功率反弹。目标定向运动和非目标定向运动同时在中央电极产生α带去同步，但目标定向运动动作的去同步更强，反弹时间更长。最有趣的是，在观察到的运动的速度分布和波段调制之间有明显的相关性。我们的数据表明，对运动行为的观察决定了皮层节律的调节，类似于运动行为执行过程中发生的调节。特别是，皮质运动系统密切跟随观察到的运动速度。这一发现为人类在动作执行运动程序中存在映射动作观察的机制（镜像机制）提供了强有力的证据。
The observation of action done by others determines a desynchronization of the rhythms recorded from cortical central regions. Here, we examined whether the observation of different types of hand movements (target directed, non-target directed, cyclic and non-cyclic) elicits different EEG cortical temporal patterns. Video-clips of four types of hand movements were shown to right-handed healthy participants. Two were target directed (grasping and pointing) motor acts; two were non-target directed (supinating and clenching) movements. Grasping and supinating were performed once, while pointing and clenching twice (cyclic movements). High-density EEG was recorded and analyzed by means of wavelet transform, subdividing the time course in time bins of 200 ms. The observation of all presented movements produced a desynchronization of alpha and beta rhythms in central and parietal regions. The rhythms desynchronized as soon as the hand movement started, the nadir being reached around 700 ms after movement onset. At the end of the movement, a large power rebound occurred for all bands. Target and non-target directed movements produced an alpha band desynchronization in the central electrodes at the same time, but with a stronger desynchronization and a prolonged rebound for target directed motor acts. Most interestingly, there was a clear correlation between the velocity profile of the observed movements and beta band modulation. Our data show that the observation of motor acts determines a modulation of cortical rhythm analogous to that occurring during motor act execution. In particular, the cortical motor system closely follows the velocity of the observed movements. This finding provides strong evidence for the presence in humans of a mechanism (mirror mechanism) mapping action observation on action execution motor programs.
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影响因子：
5.7
作者：
Babiloni, C;Babiloni, F;Rossini, PM
通讯作者：
Rossini, PM
DOI：
10.1016/s0013-4694(98)00071-6
发表时间：
1998-10-01
期刊：
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
影响因子：
--
作者：
Cochin, S;Barthelemy, C;Martineau, J
通讯作者：
Martineau, J
影响因子：
3
作者：
GREENHOUSE, SW;GEISSER, S
通讯作者：
GEISSER, S
影响因子：
5.3
作者：
Arnstein, Dan;Cui, Fang;Gazzola, Valeria
通讯作者：
Gazzola, Valeria
影响因子：
5.7
作者：
Caspers S;Zilles K;Laird AR;Eickhoff SB
通讯作者：
Eickhoff SB