多模态意识任务的脑电信号空间源定位分析  

Spatial source location analysis of EEG signals for multimodal mental tasks

作　　者：王力[1] 董倩妍 黄志鹏 谢玉怀 胡晓[1] Wang Li;Dong Qianyan;Huang Zhipeng;Xie Yuhuai;Hu Xiao(School of Mechanical and Electric Engineering,Guangzhou University,Guangzhou 510006,China;Guangzhou Laiming Biological Technology Co.,Ltd.,Guangzhou 510330,China)

机构地区：[1]广州大学机械与电气工程学院,广东广州510006 [2]广州莱铭生物科技有限公司,广东广州510330

出　　处：《电子技术应用》2018年第4期77-80,共4页Application of Electronic Technique

基　　金：广州市科技计划项目(201605030014);广州市市属高校科研项目(1201630210);广州大学科技创新培育基金

摘　　要：为了分析附加汉字默读的多模态意识任务所激活的大脑皮层,采用空间源定位分析与意识任务相关的脑电信号。首先采用独立分量分析算法将所有电极的脑电信号分解为各自独立的分量,每个分量可视为来自一个等价偶极子,并确定其在大脑皮层的位置和和方向;然后通过时频分析确定与意识任务相关的偶极子;最终分析和对比多模态意识任务和单模态意识任务之间偶极子的差异。对10位受试者进行实验,结果分析表明,与两个多模态意识任务相关的偶极子平均数量分别为5和4.3,均多于单模态任务,且偶极子数量的排序与这4个任务平均分类准确率一致,说明更多大脑皮层的激活有利于提高分类准确率,并验证了该实验的有效性和合理性。In order to analyze the cerebral cortex activating by multimodal mental tasks with reading Chinese silently,electroencephalography(EEG)signals related to mental tasks are analyzed using the spatial source location.Firstly,the EEG signals of all electrodes are decomposed into independent components by independent component analysis.Each component can be considered from an equivalent dipole,and its position and direction are calculated in the cerebral cortex.Then,the dipole associated with the mental task is determined by time-frequency analysis.Finally,the differences of dipoles from multimodal mental tasks are analyzed and compared with single mode.After analyzing the results of 10 subjects,the average numbers of dipoles associated with two multimodal mental tasks are respectively calculated as 5 and 4.3,which are more than single mode tasks.The sorting of dipole numbers is consistent with the average classification accuracies of the four tasks.It suggests that more activation of the cerebral cortex is beneficial to improve the accuracy of classification.The validity and rationality of the experiment is also verified.

关 键 词：多模态 意识任务 空间源定位 脑电信号 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]