基于左右视野双频率刺激的SSVEP脑-机接口  

Right-and-left field stimulation with two frequencies for a SSVEP-based brain-computer interface

作　　者：闫铮[1] 宾光宇[1] 高小榕[1] 

机构地区：[1]清华大学医学院,生物医学工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第12期2013-2016,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(30630022);国家“八六三”高技术项目(2006AA01Z134)

摘　　要：当可使用频率有限时,基于稳态视觉诱发电位(SSVEP)的脑-机接口(BCI)系统所能呈现的目标数较少。为了有效地增加该目标数,该文提出了一种基于左右视野、使用两个频率闪烁块呈现目标的刺激方法。5名受试者参加了试验。用典型相关分析法处理数据,提取左右视野区与刺激对应的频率成分。离线正确率分析表明:4名受试目标识别率超过85%。采用该方法,在使用2个频率时,该系统所能呈现的目标个数提高了2倍。Only a small number of targets can be presented when using limited frequencies in brain-computer interfaces（BCI） based on SSVEP（steady-state visual evoked potentials）.A method was developed for simultaneous right-and-left field stimulation with two frequencies to acquire more targets when using a screen display as the stimulator in SSVEP-BCIs.Canonical correlation analysis（CCA） was applied to extract the frequency components of the right-and-left visual fields.Offline analyses of 5 subjects show that the final accuracy for four of the subjects was more than 85%.Thus,the method with two frequencies can recognize more than twice as many targets as conventional SSVEP-BCIs.

关 键 词：脑-机接口(BCI) 稳态视觉诱发电位(SSVEP) 典型相关分析法 

分 类 号：R318[医药卫生—生物医学工程]