N200-speller using motion-onset visual response
N200-speller using motion-onset visual response
复制标题
使用运动开始视觉反应的 N200-speller
DOI：
10.1016/j.clinph.2009.06.026
复制
发表时间：
2009-09-01
影响因子：
4.7
通讯作者：
Gao, Shangkai
中科院分区：
文献类型：
--
作者：
Hong, Bo;Guo, Fei;Gao, Shangkai
目的：研制一种名为N200-speller的脑机接口。一个矩阵的运动刺激显示诱导的运动开始的视觉反应，允许受试者拼出一个消息通过头皮EEG.Methods：嵌入在一个36虚拟按钮的界面彩色视觉对象的简短运动被用来唤起一个运动开始的特定N200组件。用户将注意力集中在标有要传达的字母的按钮上，并执行颜色识别任务。计算机通过分别识别关注行和关注列来确定目标字母。将支持向量机（SVM）应用于脑机接口系统的目标检测过程中。比较了N200和经典P300拼写者的神经生理学特征。这两种范式引出具有不同时空模式的组件。对所有受试者记录的数据进行分类，结果表明，在相同的实验次数下，N200-speller和P300-speller的目标检测准确率相当。结论：运动起始刺激呈现模式具有低对比度和亮度耐受性的优点，可以应用于脑机接口。提出了一种新的运动起始范式N200拼写器，并评估了BCI拼写应用。(C)2009年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: This study presents a brain-computer interface (BCI) named N200-speller. A matrix of motion stimuli are displayed for inducing the motion-onset visual response that allows the subject to spell out a message by scalp EEG.Methods: The brief motion of chromatic visual objects embedded in a 36 virtual button onscreen interface is employed to evoke a motion-onset specific N200 component. The user focuses attention on the button labeled with the letter to be communicated and performs color recognition task. The computer determines the target letter by identifying the attended row and column respectively. A support vector machine (SVM) is used in the target detection procedures of the BCI system.Results: Ten subjects participated in this study. The neurophysiological characteristics of the N200-speller were compared with the classical P300-speller. The two paradigms elicit components with distinct spatio-temporal patterns. Classification of the data registered from all subjects reveals that the N200-speller achieves a comparable target detection accuracy with that of the P300-speller, given the same number of trials considered.Conclusions: With the advantages of low contrast and luminance tolerance, the proposed motion-onset stimulus presentation paradigm can be applied to brain-computer interface.Significance: A novel motion-onset paradigm N200-speller is proposed and assessed for BCI spelling application. (C) 2009 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.