Tun Nyi Nyi, Sanuki Fumiya, Iramina Keiji
Annu Int Conf IEEE Eng Med Biol Soc. 2021 Nov;2021:783-786. doi: 10.1109/EMBC46164.2021.9629969.
Correlation between brain and muscle signal is referred to as functional coupling. The amount of correlation between two signals greatly depends on the motor task performance. In this study, we designed the experimental paradigm with four types of motor tasks such as real hand grasping movement (RM), movement intention (Inten), motor imagery (MI) and only looking at virtual hand in three dimensional head mounted display (OL). We aimed to investigate EEG-EMG correlation with linear and nonlinear coupling methods. The results proved that high correlation could be occurred in RM and Inten tasks rather than MI and OL tasks in both linear and nonlinear methods. High coherence occurred in beta and gamma bands of RM and Inten tasks whereas no coherence was detected in MI and OL tasks. In terms of nonlinear correlation, the high mutual information was detected in RM and Inten tasks. There was slight mutual information in MI and OL tasks. The results showed that the coherence in the contralateral brain cortex was higher than in the ipsilateral motor cortex during motor tasks. Furthermore, the amount of EEG-EMG functional coupling changed according to the motor task executed.
大脑与肌肉信号之间的相关性被称为功能耦合。两个信号之间的相关程度很大程度上取决于运动任务的执行情况。在本研究中，我们设计了包含四种运动任务的实验范式，如真实手部抓握运动（RM）、运动意图（Inten）、运动想象（MI）以及仅在三维头戴式显示器中观看虚拟手（OL）。我们旨在采用线性和非线性耦合方法研究脑电图（EEG）与肌电图（EMG）的相关性。结果证明，在线性和非线性方法中，RM和Inten任务中的相关性高于MI和OL任务。RM和Inten任务的β和γ频段出现高相干性，而MI和OL任务中未检测到相干性。就非线性相关性而言，RM和Inten任务中检测到高互信息。MI和OL任务中存在轻微互信息。结果表明，在运动任务期间，对侧大脑皮层的相干性高于同侧运动皮层。此外，EEG-EMG功能耦合的程度会根据执行的运动任务而变化。
