Could the beta rebound in the EEG be suitable to realize a "brain switch"?
Could the beta rebound in the EEG be suitable to realize a "brain switch"?
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DOI：
10.1016/j.clinph.2008.09.027
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发表时间：
2009-01-01
影响因子：
4.7
通讯作者：
Solis-Escalante, T.
中科院分区：
文献类型：
--
作者：
Pfurtscheller, G.;Solis-Escalante, T.
目的：进行足部运动想象伴随着想象前后的ERD和想象后的β ERS（β反弹）。我们的目的是研究是否后图像贝塔反弹是一个简单的“大脑开关”的合适功能。这样的大脑开关是一个专门设计的脑-机接口（BCI），其目的是检测只有一个预定义的大脑状态（如EEG模式）在正在进行的大脑activity.Method：一个EEG（拉普拉斯）记录在顶点在线索为基础的轻快的脚运动图像进行了分析，在5名健康受试者。在6和40 Hz之间详细分析了围成像ERD和后成像β反弹（ERS），并与两个支持向量机分类。结果：ERD被检测到正在进行的EEG（模拟异步BCI）的真阳性率（TPR）为28.4% +/- 13.5和β反弹的TPR为59.2% +/- 20.3。在每个具有30个线索的单次运行中，用于β反弹检测的TPR为78.6% +/-12.8。结论：足运动想象过程中Cz处的β反弹是一个相对稳定的、可重复的现象，在单通道脑电实验中可检测到，且β反弹是一个很好的特征，可用于单通道脑电实验中实现“脑开关”。(C)2008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: Performing foot motor imagery is accompanied by a peri-imagery ERD and a post-imagery beta ERS (beta rebound). Our aim was to study whether the post-imagery beta rebound is a suitable feature for a simple "brain switch". Such a brain switch is a specifically designed brain-computer interface (BCI) with the aim to detect only one predefined brain state (e.g. EEG pattern) in ongoing brain activity.Method: One EEG (Laplacian) recorded at the vertex during cue-based brisk foot motor imagery was analysed in 5 healthy subjects. The peri-imagery ERD and the post-imagery beta rebound (ERS) were analysed in detail between 6 and 40 Hz and classified with two support vector machines.Results: The ERD was detected in ongoing EEG (simulation of asynchronous BCI) with a true positive rate (TPR) of 28.4% +/- 13.5 and the beta rebound with a TPR of 59.2% +/- 20.3. In single runs with 30 cues each, the TPR for beta rebound detection was 78.6% +/- 12.8. The false positive rate was always kept below 10%.Conclusion: The findings suggest that the beta rebound at Cz during foot motor imagery is a relatively stable and reproducible phenomenon detectable in single EEG trials.Significance: Our results indicate that the beta rebound is a suitable feature to realize a "brain switch" with one single EEG (Laplacian) channel only. (C) 2008 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.