Abstract:Cortico-muscular coupling can reflect the connection between cerebral cortex and muscle in sensorimotor. This paper proposed a new cortico-muscular coupling analysis method, that is utilizing EEG and cumulative spike train (CST) obtained after the decomposition of the motor unit to linearly transmit the neural drive for coherence analysis, quantitatively assessing cortico-muscular coupling and common synaptic input of neurons under different frequency band at different contraction force levels during upper limb grasping. The synchronous EEG and sEMG data of flexor digitorum superficialis (FDS) and flexor carpi ulnaris (FCU) were measured and analyzed in 10 healthy subjects. Results showed that both frequency band (F (4, 8)=337.2, P<0.01) and contractile force level (F (2,8)=12.15, P<0.01) had significant effects on the intermuscular coupling during upper limb grasping exercise, especially in β and α band. At 30% MVC, the mean coherence of β frequency band was 0.23 ± 0.10, and that of α frequency band was 0.47 ± 0.02. The synaptic input controls the level of contraction force. Cortico-muscular coupling was relatively low. The highest coupling strength was in β band with a coherence value of 0.12 ± 0.01 at 30% MVC. The CST brain muscle coupling analysis can reflect the coupling characteristics and common synaptic inputs of various frequency bands and contraction levels between brain muscles, providing a new method for brain muscle coupling analysis.
苏佳豪, 佘青山, 张建海, 马玉良, 范影乐. 基于运动单元累计尖峰序列的脑肌耦合分析[J]. 中国生物医学工程学报, 2023, 42(4): 385-393.
Su Jiahao, She Qingshan, Zhang Jianhai, Ma Yuliang, Fan Yingle. Cortico-Muscular Coupling Analysis Based on Cumulative Spike Sequence of Motor Unit. Chinese Journal of Biomedical Engineering, 2023, 42(4): 385-393.
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