基于SSMVEP的脑-机接口视觉刺激探究  

Study of Steady State Motion Visual Evoked Potential-based Visual Stimulation of BCI System

作　　者：刘贵彤 张志敏 柴晓珂 路阳婷 樊瑜波[1,2] 牛海军 LIU Guitong;ZHANG Zhimin;CHAI Xiaoke;LU Yangting;FAN Yubo;NIU Haijun(School of Biological Science and Medical Engineering,Beihang University,Beijing,100083;Beijing Advanced Innovation Center for Biomedical Engineering,Beihang University,Beijing,100083)

机构地区：[1]北京航空航天大学生物与医学工程学院,北京市100083 [2]北京市生物医学工程高精尖中心,北京市100083

出　　处：《中国医疗器械杂志》2018年第5期313-316,共4页Chinese Journal of Medical Instrumentation

基　　金：国家高技术研究发展计划课题(2015AA042304);国家科技部支撑计划课题(2015BAI06B02)

摘　　要：目的提出一种基于稳态运动视觉刺激诱发电位(SSMVEP)的方环运动刺激,并与目前常用的视觉刺激方式(牛顿环运动、方形闪烁和圆形闪烁)进行比较。方法选择9名受试者,分别采用四种刺激方式诱发脑电信号,采用典型相关分析(CCA)进行模式识别,并结合识别准确率与主观评分结果对刺激评价。结果方环运动诱发的脑电信号识别准确率(82.8%±14.1%)与牛顿环运动(83.3%±11.5%)相当,无显著性差异,但二者都低于方形闪烁(98.3%±4.1%)和圆形闪烁(99.2%±1.8%);图形形状对相同刺激模式(运动及闪烁)诱发的脑电信号识别准确率没有显著影响;方环运动的主观评价优于牛顿环运动、方形闪烁和圆形闪烁。结论方环运动刺激可以有效诱发脑电信号,并降低图形闪烁带来的不适感,可以作为视觉刺激应用于基于SSMVEP的BCI中。Objective To propose a square’s ring motion stimulation based on steady-state motion visual evoked potential, and compare it with the commonly used visual stimulation modes （Newton＇s ring motion, square ？icker and circular ？icker）. Methods EEG signals were collected while 9 experimental subjects gazing at four stimulation and pattern analyzed by Canonical Correlation Analysis （CCA）. Stimulation were evaluated by recognition accuracy and subjective scores. Results The classification accuracies of SSVEP elicited by the square’s ring motion（82.8%±14.1%） and Newton＇s ring（83.3%±11.5%） have no signi？cant di？erence between them, which are lower than that of the square ？icker（98.3%±4.1%） and the circular ？icker（99.2%±1.8%）. The shape of the ？gure has no signi？cant in？uence on the classi？cation accuracy either in motion mode or ？icker mode. The comfort of the square’s ring motion is higher than the other three stimulation according to subjective scores. Conclusion The square’s ring motion can elicit EEG and reduce the discomfort caused by ？icker modes. The square’s ring motion can be used as a visual stimulation in SSMVEP-based BCI system.

关 键 词：稳态运动视觉诱发电位 视觉刺激 准确率 舒适度 

分 类 号：R318[医药卫生—生物医学工程]