Department of Neurological Surgery, University of Washington, Seattle, Washington, USA.
J Clin Neurophysiol. 2013 Jun;30(3):299-307. doi: 10.1097/WNP.0b013e3182872f40.
Power changes in the beta frequency range (17-25 Hz) in the human motor and premotor areas during action observation have been associated with the mirror neuron system and have been studied extensively. These changes mimic motor activity during actual motion execution, albeit reduced in strength. Recent noninvasive (EEG/magnetoencephalography) and invasive studies (electrocorticography) have shown that during actual motion, beta power changes are accompanied by highly localized changes in the high gamma band (70-100 Hz). In this study, we investigate, using 27-channel EEG in combination with a generic head model and a cortical mapping algorithm, whether such high gamma changes are also present during motion observation. Subjects were presented with a 2.7-second video of a moving hand, contrasted with a video of moving scenery of equal length. Our results show nonlateralized beta band decrease in power in response to the moving hand versus the response to the moving scenery. We also find significant increase in high gamma power. However, unlike the beta band response, increases in this band are lateralized, with a preference for the hemisphere of the dominant hand.
在人类运动和运动前区域中，观察动作时β频带（17-25Hz）的功率变化与镜像神经元系统有关，并已得到广泛研究。这些变化模拟了实际运动执行期间的运动活动，尽管强度降低。最近的非侵入性（EEG/脑磁图）和侵入性研究（皮层电图）表明，在实际运动过程中，β功率变化伴随着高γ频带（70-100Hz）的高度局部化变化。在这项研究中，我们使用 27 通道 EEG 结合通用头部模型和皮层映射算法，研究在运动观察期间是否也存在这种高γ变化。研究对象观看了 2.7 秒的移动手视频，与长度相等的移动风景视频进行对比。我们的结果表明，与移动风景的反应相比，移动手的β频带功率呈非侧化降低。我们还发现高γ功率显著增加。然而，与β频带反应不同，该频段的增加是偏侧化的，对手的优势半球有偏好。
