Localization of brain electrical activity sources and hemodynamic activity foci during motor imagery
Localization of brain electrical activity sources and hemodynamic activity foci during motor imagery
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DOI：
10.1134/s0362119714030062
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发表时间：
2014-05-01
期刊：
影响因子：
--
通讯作者：
Konovalov, R. N.
中科院分区：
文献类型：
--
作者：
Frolov, A. A.;Husek, D.;Konovalov, R. N.
研究了对对应于运动图像的脑电模式做出最大贡献的大脑活动的来源。它们分类的准确性决定了脑机接口(BCI)的效率，它直接通过大脑信号控制外部技术设备，而不涉及肌肉活动。脑活动源通过独立分量分析进行识别。提供最大BCI分类精度的独立分量被认为与运动想象任务相关。两个最相关的来源在对侧和同侧手部运动的成像中表现出明显的事件相关的去同步化和u节律的同步化。这些来源是通过解决逆EEG问题来定位的，并适当考虑了磁共振成像确定的大脑及其覆盖物的个别几何形状。每一种来源都定位于初级躯体感觉皮质的3a区，与对侧手的本体感觉敏感性相对应。它们的位置接近fMRI获得的BOLD活动灶。
The sources of brain activity that make the maximum contribution to EEG patterns corresponding to motor imagery have been studied. The accuracy of their classification determines the efficiency of brain-computer interface (BCI) for controlling external technical devices directly by brain signals, without the involvement of muscle activity. Brain activity sources are identified by independent component analysis. The independent components providing the maximum BCI classification accuracy are considered relevant for the motor imagery task. The two most relevant sources exhibit clearly marked event-related desynchronization and synchronization of the mu-rhythm during the imagery of contra- and ipsilateral hand movements. These sources were localized by solving the inverse EEG problem with due consideration for individual geometry of the brain and its covers, as determined by magnetic resonance imaging. Each of the sources was shown to be localized in the 3a area of the primary somatosensory cortex corresponding to proprioceptive sensitivity of the contralateral hand. Their positions were close to the foci of BOLD activity obtained by fMRI.