基于伪随机序列调制彩色视觉刺激的脑机接口  

Brain Computer Interface System Based on Pseudo Random Sequence Modulated Chromatic Visual Stimulation

作　　者：刘大成[1] 胡南[1] 常春起[2] 孙兵[1] 

机构地区：[1]苏州大学电子信息学院,苏州215006 [2]深圳大学生物工程医学院,深圳518060

出　　处：《数据采集与处理》2017年第1期191-197,共7页Journal of Data Acquisition and Processing

基　　金：江苏省高校自然科学研究面上项目(14KJB310020)资助项目;苏州市科技计划(SYS201521)资助项目

摘　　要：脑机接口(Brain-computer interface,BCI)是一种新颖的人机交互方式,是通过人的大脑意图和计算机直接进行交流。本文提出了一种基于伪随机序列调制彩色视觉刺激,产生彩色瞬态视觉诱发电位(Chromatic transient visual evoked potential,CTVEP)的BCI系统设计与信号处理方法。根据视觉特性,彩色圆环的交替呈现与消失作为视觉刺激被证明更加舒适和安全。在本文研究中,屏幕上同时呈现36个彩色圆环刺激,每个刺激的呈现与消失模式由相互正交的36个伪随机Gold序列中的唯一的一个给定。针对采集的枕区脑电信号,利用Gold序列的正交性,本文给出CTVEP的解码方法,通过匹配滤波判断被试注视的刺激图案。通过对20名被试的实验,给出了系统的识别准确率,验证了此系统在"翻译"被试选择时的可靠性。Brain-computer interface（BCI）is a novel way for interaction between human and machine,which enables direct communication between the people′s mind and the computer.BCI system and its signal processing method are proposed based on pseudo random sequence modulated color visual stimulation and the chromatic transient visual evoke potential（CTVEP）.According to the properties of human visual system,it has been demonstrated that chromatic visual stimulation is safer and more comfortable for various subjects.In the proposed BCI system,a number of spatially separated chromatic con-central rings will be simultaneously presented on and off,with on/off pattern each specified by a distinct sequence form 36 pseudo random Gold sequences.For the received data from occipital region,we have proposed a demodulation method based on the orthogonality among Gold sequences,and the subject focusing pattern is ultimately determined by using matched filtering.After experiments on 20 subjects,the identification accuracy of the proposed system was achieved,which has verified the validity of the system in translating the ideas of the subjects.

关 键 词：脑电图 脑机接口 GOLD序列 彩色瞬态视觉诱发电位 

分 类 号：TP334[自动化与计算机技术—计算机系统结构] R318.6[自动化与计算机技术—计算机科学与技术]