Li Jiaying, Zhao Li, Bian Yan, Li Min, Jia Zhichao
Tianjin Key Laboratory of Information Sensing and Intelligent Control, Tianjin University of Technology and Education, Tianjin 300222, P.R.China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2021 Jun 25;38(3):425-433. doi: 10.7507/1001-5515.202007004.
Motor imaging therapy is of great significance to the rehabilitation of patients with stroke or motor dysfunction, but there are few studies on lower limb motor imagination. When electrical stimulation is applied to the posterior tibial nerve of the ankle, the steady-state somatosensory evoked potentials (SSSEP) can be induced at the electrical stimulation frequency. In order to better realize the classification of lower extremity motor imagination, improve the classification effect, and enrich the instruction set of lower extremity motor imagination, this paper designs two experimental paradigms: Motor imaging (MI) paradigm and Hybrid paradigm. The Hybrid paradigm contains electrical stimulation assistance. Ten healthy college students were recruited to complete the unilateral movement imagination task of left and right foot in two paradigms. Through time-frequency analysis and classification accuracy analysis, it is found that compared with MI paradigm, Hybrid paradigm could get obvious SSSEP and ERD features. The average classification accuracy of subjects in the Hybrid paradigm was 78.61%, which was obviously higher than the MI paradigm. It proves that electrical stimulation has a positive role in promoting the classification training of lower limb motor imagination.
运动想象疗法对中风或运动功能障碍患者的康复具有重要意义，但关于下肢运动想象的研究较少。当对踝关节的胫后神经施加电刺激时，可在电刺激频率下诱发稳态体感诱发电位（SSSEP）。为了更好地实现下肢运动想象的分类，提高分类效果，丰富下肢运动想象的指令集，本文设计了两种实验范式：运动想象（MI）范式和混合范式。混合范式包含电刺激辅助。招募了10名健康大学生在两种范式下完成左右脚的单侧运动想象任务。通过时频分析和分类准确率分析发现，与MI范式相比，混合范式能够获得明显的SSSEP和事件相关去同步化（ERD）特征。混合范式下受试者的平均分类准确率为78.61%，明显高于MI范式。这证明电刺激对促进下肢运动想象的分类训练具有积极作用。
