SOURCES OF EEG ACTIVITY MOST RELEVANT TO PERFORMANCE OF BRAIN-COMPUTER INTERFACE BASED ON MOTOR IMAGERY
SOURCES OF EEG ACTIVITY MOST RELEVANT TO PERFORMANCE OF BRAIN-COMPUTER INTERFACE BASED ON MOTOR IMAGERY
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DOI：
10.14311/nnw.2012.22.002
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发表时间：
2012-01-01
影响因子：
0.8
通讯作者：
Mokienko, Olesya
中科院分区：
文献类型：
--
作者：
Frolov, Alexander;Husek, Dusan;Mokienko, Olesya
本文研究了大脑活动的来源，有助于脑电图模式对应的运动图像在训练中控制脑机接口。为了确定训练期间记录的脑电图中的个体源贡献，使用了独立成分分析。然后，将BCI系统分类准确率最高的独立成分视为与执行运动想象任务相关，因为它们充分暴露了在想象命令同侧手运动时感觉运动节奏的事件相关的去同步和事件相关的同步。为了揭示这些成分的神经生理性质，我们解决了脑电逆问题，以确定导致这些成分出现在脑电中的脑活动来源。这些源位于初级感觉运动皮层的手部表征区。它们的位置几乎与fMRI研究中获得的运动想象中大脑活动的区域一致。在定位源时，考虑了解剖MR图像提供的脑及其覆盖的个体几何形状。
The paper examines sources of brain activity, contributing to EEG patterns which correspond to motor imagery during training to control brain-computer interface. To identify individual source contribution into electroencephalogram recorded during the training Independent Component Analysis was used. Then those independent components for which the BCI system classification accuracy was at maximum were treated as relevant to performing the motor imagery tasks, since they demonstrated well exposed event related de-synchronization and event related synchronization of the sensorimotor it-rhythm during imagining of command ipsilateral hand movements. To reveal neurophysiological nature of these components we have solved the inverse EEG problem to locate the sources of brain activity causing these components to appear in EEG. The sources were located in hand representation areas of the primary sensorimotor cortex. Their positions practically coincide with the regions of brain activity during the motor imagination obtained in fMRI study. Individual geometry of brain and its covers provided by anatomical MR images was taken into account when localizing the sources.