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作 者:伍彪 覃兵 吴鑫[1] 周璐 钱志余[1] 李韪韬[1] 高凡 祝桥桥 WU Biao;QIN Bing;WU Xin;ZHOU Lu;QIAN Zhiyu;LI Weitao;GAO Fan;ZHU Qiaoqiao(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
机构地区:[1]南京航空航天大学自动化学院,南京211106
出 处:《数据采集与处理》2022年第1期164-172,共9页Journal of Data Acquisition and Processing
基 金:国家自然科学基金重大科研仪器研制项目(81827803,81727804);国家自然科学基金(61875085,11902154);江苏省重点研发计划(社会发展)(BE2020705);江苏省自然科学基金(BK20190387);南京航空航天大学国家重大项目培育基金(NP2020303);江苏省大学生创新创业训练项目(202010287208T)。
摘 要:近年来基于运动想象(Motor imagery,MI)的脑-机接口(Brain-computer interface,BCI)技术迅速发展,广泛运用于各个领域。为了比较运动执行(Motor execution,ME)与MI脑电活动的差异,本文提出一种基于脑电信号(Electroencephalogram,EEG)时频域分析的方法。通过设计视觉诱导的上肢ME与MI对照实验,对被采集的10名健康被试的EEG数据进行预处理,并提取各波段特征值,最后分析ME与MI各波段功率值和同一波段功率差值。结果显示,MI过程alpha波为优势波,ME过程delta波为优势波。与MI相比,ME中alpha波呈下降趋势,delta波呈上升趋势。本研究结果表明,ME与MI的脑电活动有明显差异性,为进一步提高基于MI的BCI系统的实时性和普适性提供了理论和数据支撑。The technology of brain-computer interface(BCI)based on motor imagery(MI)has developed rapidly in the past few decades and been widely used in various fields.To compare the brain electrical activity difference between motor execution(ME)and MI,a method based on the time-frequency domain analysis of electroencephalogram(EEG)is proposed.The visually induced upper limb ME and MI control experiments are conducted and the EEG signals of ten healthy subjects are collected and preprocessed.Then the signals are decomposed and converted into eigenvalues of each band through the time-frequency analysis method.Finally,the power values of each band of ME and MI are analyzed and the power differences between each band of ME and MI are computed.The results show that the alpha wave is dominant wave in the process of MI while the delta wave is dominant wave in the process of ME.Compared with MI,the alpha wave during ME shows a downward trend and the delta wave shows an upward trend.The results of this study show that there is significant difference in EEG between ME and MI,which is important for improving the real-time and universal performance of MI based BCI systems.
关 键 词:脑电信号 时频分析 运动想象 运动执行 脑-机接口
分 类 号:R318[医药卫生—生物医学工程]
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