一种基于皮层成像的自动眼电伪迹去除方法  

Automatic Correction of the Ocular Artifacts in EEG Based on a Cortex Imaging Method

作　　者：刘铁军[1] 田银[1] 尹刚[1] 尧德中[1] 

机构地区：[1]电子科技大学生命科学与技术学院神经信息过程与计算重点实验室,成都610054

出　　处：《中国生物医学工程学报》2009年第1期17-21,41,共6页Chinese Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(60571019)

摘　　要：脑电信号十分微弱,并且特别容易受到眼电的干扰。这些干扰给阅读和分析脑电信号带来了很大的困难,因此自动消除眼电对脑电的干扰一直是研究人员重视的问题。本研究提出一种基于皮层成像的自动眼电伪迹去除方法,对于已经完成滤波的脑电数据段,通过设立阈值的方法识别伪迹,利用基于相关系数的眼电伪迹识别算法标记眼电伪迹数据段,然后通过结合脑电信号时空信息的、基于皮层成像技术的眼电伪迹处理方法(CAST),处理已经标记好的眼电伪迹数据段,并通过真实的事件相关电位数据验证了方法的有效性。验证结果表明,此方法能够实现眼电伪迹的自动识别和去除,去除伪迹后的信号与原始无眼电伪迹的标准信号之间的相关系数为0.953 7±0.042 3。The signal of electroencephalogram （EEG） is usually very weak and often contaminated by electrooculogram （EOG）, which made the signal processing and explanation very difficulty, especially for the automatic analysis and identification of the cognitive events. For this reason effective automatic correction method has been a long time desired technique. In this work, an automatic correction method base on cortex imaging was presented to remove the ocular artifact. Validity of the proposed method was evaluated by using the data of EventRelated Potentials （ERPs）. The results showed that this method could automatic correct the ocular artifacts in the EEG. The average correlation coefficient between the corrected data and that without artifacts was 0.953 7 ± 0.042 3.

关 键 词：眼电伪迹 脑电 皮层成像 

分 类 号：R318[医药卫生—生物医学工程]