基于相干性的多频段脑肌电信号双向耦合分析

摘要

针对皮层肌肉相干性分析时不能确定耦合方向的局限性,根据神经肌肉信息的双向传递性,提出利用不同大脑功能区的脑电信号和动作相关的肌电信号,实现了相干函数对脑肌电信号的双向耦合分析.本文对不同握力模式下同步采集的脑肌电信号进行了多频段耦合分析.通过下行(EEG—>EMG)和上行(EMG—>EEG)分析发现,随着握力的增大,EEG能量、相干幅值和耦合强度均向高频段转移.与基于新型格兰杰因果关系的耦合方法进行比较,验证了相干性方法进行皮层肌肉双向耦合分析的可行性和优势.研究结果为探索基于皮层肌肉相干性的双向手部运动信息解码和上肢运动功能障碍分析提供了依据.%For CMC have the limitation that can't determine the direction of the coupling,different functional areas of EEG signals and the EMG signals are adopted to realize the bidirectional coupling analysis,according to the bidi-rectional transmission of neuromuscular information. The multi-band coupling analysis of EEG-EMG signals under multi-grip mode is performed in the different functional areas. Through the downstream( EEG->EMG) and upstream (EMG->EEG) analysis,it is found that the signal energy of EEG,amplitude and coupling strength of coherence shift to higher frequency with the increase of grip strength. Compared with method based on granger causality rela-tion, the feasibility and advantage of the coherence method are verified in the bidirectional coupling analysis of brain-muscle connectivity. The results of the study provide the basis for the two-way information decoding of hand motion and the analysis of upper limb dysfunction.