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-  2018 

多模式刺激下运动想象脑电信号的特征调制研究

DOI: doi:10.7507/1001-5515.201708061

Keywords: 运动想象, 事件相关去同步, 动态刺激, 激活

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Abstract:

事件相关去同步(ERD)现象是脑电信号的基本特征,以 ERD 特征分析为基础的运动想象脑–机接口在运动功能康复方面具有重要意义。能否有效提取脑电信号中的 ERD 特征是决定脑–机接口性能的关键,因此研究受试者何种刺激模式下会产生明显的 ERD 特征至关重要。本文试验设计了 4 种不同的刺激模式(静态文字刺激、抓握视频刺激、手指序列运动视频刺激以及带声音的手指序列运动视频刺激),并分析了这几种刺激模式下的 ERD 特征。综合时频图谱、功率谱曲线、ERD 值和脑地形图分析结果发现,手指序列运动视频刺激和带声音的手指序列运动视频刺激模式下,激发的 ERD 特征程度更深、范围更广,在以 ERD 特征分析为基础的脑–机接口的实际应用中也会有更好的效果,也可以在一定程度上提高脑–机接口系统使用者的认可度和接受度

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