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多类运动想象脑机接口控制的虚拟漫游

发表时间:2012-03-15  浏览量:1137  下载量:549
全部作者: 谷艳蕾,张吉财,罗建勋,李懿,陈卫东,郑筱祥
作者单位: 浙江大学求是高等研究院;浙江大学生物医学工程与仪器科学学院;浙江大学计算机科学与技术学院
摘 要: 研究旨在区分想象左手、右手、脚运动三种状态下的脑电信号,从而建立在虚拟环境中控制左转、右转、前行、停止的脑机接口(brain computer interface, BCI)系统。利用虚拟现实技术搭建虚拟的三维房屋,房屋的移动或转动会给予被试相应的反馈刺激,这种反馈可以增强被试的运动想象。在算法方面,首先,分别运用共空间模式(common spatial pattern,CSP)的特征提取方法和经验模态分解(empirical mode decomposition,EMD)的时域频域空域特征提取方法,对不同状态的脑电(electroencephalogram,EEG)信号进行特征提取。然后,运用支持向量机(support vector machine, SVM)、概率神经网络(probabilistic neural network, PNN),以及线性判别分析(linear discriminant analysis,LDA)算法对提取的不同状态的脑电特征分别进行分类识别。通过对比分析,选出较好的特征提取方法和分类算法,并尝试一种在线实验方案:通过区分被试通过想象左手、右手、脚的运动,控制在虚拟房间中左转、右转、前行;通过静息状态,控制静止于房间中。 �
关 键 词: 生物工程;脑机接口;多类运动想象;虚拟现实
Title: Virtual navigation based on multi-class motor imaginary brain computer interface
Author: GU Yanlei, ZHANG Jicai, LUO Jianxun, LI Yi,CHEN Weidong, ZHENG Xiaoxiang
Organization: Qiushi Academy for Advanced Studies, Zhejiang University; College of Biomedical Engineering and Instrument Science, Zhejiang University; College of Computer Science and Technology, Zhejiang University
Abstract: This study aims to distinguish the imagination of left hand, right hand and feet movement, so as to establish a brain computer interface (BCI) system controlling a virtual navigation in virtual apartment. Firstly, using the feature extraction method of common spatial pattern (CSP) and that of the time, frequency and spatial domains of empirical mode decomposition (EMD), features of the four states of electroencephalogram (EEG) signal were extracted. Then, the extraction results were classified using support vector machine (SVM), probabilistic neural network (PNN), linear discriminant analysis (LDA) algorithm as classifiers. Feature extraction methods and classifiers were compared and analyzed to choose better methods of feature extraction and classification. An online virtual navigation experiment was carried out by distinguishing four states.�
Key words: bioengineering; brain computer interface; multi-class motor imaginary; virtual reality
发表期数: 2012年3月第5期
引用格式: 谷艳蕾,张吉财,罗建勋,等. 多类运动想象脑机接口控制的虚拟漫游[J]. 中国科技论文在线精品论文,2012,5(5):469-474.
 
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