Saied Piri - Research Center for Computational Cognitive Neuroscience, System & Cybernetic Laboratory, Imam Reza International University, Mashhad, Iran
Arefeh Dinarvand - UAST-University of Applied Science and Technology X-IBM Institute, Tehran, Iran
Kazem Sohrabi - Bachelor of Aerospace Engineering majoring in air structures, Shahid Sattari Aeronautical University, Tehran, Iran

EEG-based BCI was recently applied to lower limb exoskeleton robots. Various machine learning decoders have shown high accuracy performance on classifying the gait state whether the subject is walking or standing. However, there is a trade-off between the accuracy and the responsiveness due to the delay time. The delay time is critical when controlling the exoskeleton robots with EEG decoders online (real-time). In this research, we propose spatio-spectral convolutional neural networks with relatively short segment of EEG data (۰.۲s) having ۸۳.۴% accuracy on gait state recognition. The gait intention recognition that detects the subject’s gait intention prior to the actual gait had ۷۷.۳% accuracy. We were able to classify EEG data of both healthy subjects and stroke patients at sub-acute and chronic phases.

Brain-Computer Interface; EEG; Convolutional Neural Network; Lower-limb; Gait Rehabilitation