双人肢体协作动作运动想象脑电的ERD/ERS特征分析  

ERD/ERS characteristics analysis for motor imagery EEG of double joint action

作　　者：姚树璋 徐佳琳 左国坤 黄志权[1] 李寒 盛俊鹏 连士东 YAO Shuzhang;XU Jialin;ZUO Guokun;HUANG Zhiquan;LI Han;SHENG Junpeng;LIAN Shidong(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024;Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Cixi Institute of Biomedical Engineering,Ningbo,Zhejiang Province 315201;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]太原科技大学机械工程学院,太原030024 [2]中国科学院宁波材料技术与工程研究所,慈溪生物医学工程研究所,浙江宁波315201 [3]中国科学院大学,北京100049

出　　处：《北京生物医学工程》2023年第4期331-340,共10页Beijing Biomedical Engineering

基　　金：国家重点研发计划(2018YFA0707301);国家自然科学基金(52075357);浙江省自然科学基金(LQ19F030002);浙江省“尖兵”“领雁”研发攻关计划(2022C03029);宁波市科技创新2025重大专项(2020Z082);宁波市自然科学基金(2021J034)资助。

摘　　要：目的基于运动想象(motor imagery,MI)的脑机接口(brain computer interface,BCI)一般采用基于单人肢体动作的MI任务范式,诱发的事件相关去同步/同步(event-related desychronization/synchronization,ERD/ERS)模式及对应的可辨识思维类别数较为有限,无法满足BCI对外多指令控制。为此,本文在单人肢体动作MI的基础上引入双人肢体协作动作MI,探索双人肢体协作动作MI的脑电(electroencephalograph,EEG)信号的多脑区ERD/ERS特征。方法采用自回归模型功率谱估计和事件相关谱扰动方法,对被试者执行单人左/右手动作MI、双人左/右手协作动作MI的EEG数据,进行频率-空间-时间特性对比分析与研究。结果区别于单人左/右手动作MI,双人左/右手协作动作MI的EEG信号在大脑额叶区出现ERD特征,在感觉运动皮质区出现ERD、ERS特征,特征的频带更宽;感觉运动皮质区的ERD特征出现时间较晚、持续时间更长,且ERD、ERS特征的对比度更大。结论在相同肢体部位的前提下,双人肢体协作动作MI过程有可能增加BCI的思维类别数,且其EEG特征更易辨识。Objective The motor imagery(MI)based brain computer interface(BCI)system generally adopts the task paradigm of single action.The induced patterns of event-related desynchronization/synchronization(ERD/ERS)and corresponding recognizable thinking categories are limited,which can not satisfy the external multi-command control of BCI.Therefore,based on the single action motor imagery,this paper introduces the double joint action motor imagery,and explores the ERD/ERS characteristics of double joint action motor imagery based electroencephalograph(EEG)in multi-brain regions.Methods By using autoregressive model power spectrum estimation and event-related spectral perturbation methods,the frequency-space-time characteristics of the subjects’MI-EEG data based on single action and double joint action by left/right hand are comparatively analyzed and studied.Results Different from the characteristics of MI-EEG based on single action by left/right hand,the MI-EEG based on double joint action by left/right hand has the ERD characteristics in the frontal lobe of the brain,and also has the ERD and ERS characteristics in the sensory motor cortex area.The corresponding frequency band of characteristics are wider.What’s more,the ERD characteristics in the sensory motor cortex appear to be later,but have longer duration,and the contrast of the ERD and ERS characteristics in the sensory motor cortex is greater.Conclusions Under the premise of the same limb part,the double joint action motor imagery may increase the number of thinking categories of BCI,and its EEG characteristics are easier to identify.

关 键 词：脑机接口 运动想象 双人肢体协作动作 脑电信号 事件相关去同步/同步 

分 类 号：R318.04[医药卫生—生物医学工程]