Offline Identification of Imagined Speed of Wrist Movements in Paralyzed ALS Patients from Single-Trial EEG.
Offline Identification of Imagined Speed of Wrist Movements in Paralyzed ALS Patients from Single-Trial EEG.
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DOI：
10.3389/neuro.20.003.2009
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发表时间：
2009
影响因子：
4.3
通讯作者：
Birbaumer N
中科院分区：
文献类型：
--
作者：
Gu Y;Farina D;Murguialday AR;Dremstrup K;Montoya P;Birbaumer N
该研究调查了从肌萎缩侧索硬化症（ALS）患者的脑电图记录中识别想象运动速度的可能性。脑电图信号是在想象以两种速度（快和慢）进行手腕伸展时从四名 ALS 患者身上获取的，每种速度以随机顺序重复最多 100 次。从脑电图记录中获得与这两项任务相关的运动相关皮层电位（MRCP）和平均感觉运动节律。此外，使用离散小波变换进行特征提取和支持向量机进行分类，进行离线单试验脑电图分类。任务的速度被编码为 MRCP 中负峰值的时间延迟，更快的运动比更慢的运动更短。当为每个人选择最佳头皮位置和时间间隔时，速度之间的平均单次试验错误分类率为30.4±3.5%。导致最低错误分类率的头皮位置和时间间隔因患者而异。结果表明，想象不同速度的运动是 ALS 患者控制脑机接口系统的可行策略。
The study investigated the possibility of identifying the speed of an imagined movement from EEG recordings in amyotrophic lateral sclerosis (ALS) patients. EEG signals were acquired from four ALS patients during imagination of wrist extensions at two speeds (fast and slow), each repeated up to 100 times in random order. The movement-related cortical potentials (MRCPs) and averaged sensorimotor rhythm associated with the two tasks were obtained from the EEG recordings. Moreover, offline single-trial EEG classification was performed with discrete wavelet transform for feature extraction and support vector machine for classification. The speed of the task was encoded in the time delay of peak negativity in the MRCPs, which was shorter for faster than for slower movements. The average single-trial misclassification rate between speeds was 30.4 ± 3.5% when the best scalp location and time interval were selected for each individual. The scalp location and time interval leading to the lowest misclassification rate varied among patients. The results indicate that the imagination of movements at different speeds is a viable strategy for controlling a brain-computer interface system by ALS patients.
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DOI：
10.1016/j.clinph.2008.06.019
发表时间：
2008-11
期刊：
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
影响因子：
--
作者：
Kübler A;Birbaumer N
通讯作者：
Birbaumer N
影响因子：
5.7
作者：
Pfurtscheller, G.;Brunner, C.;da Silva, F. H. Lopes
通讯作者：
da Silva, F. H. Lopes
影响因子：
3
作者：
Farina, Dario;do Nascimento, Omar Feix;Doncarli, Christian
通讯作者：
Doncarli, Christian
影响因子：
9.9
作者：
Kübler, A;Nijboer, F;Wolpaw, JR
通讯作者：
Wolpaw, JR
影响因子：
7.5
作者：
CORTES, C;VAPNIK, V
通讯作者：
VAPNIK, V