Riemann Kernel Support Vector Machine Recursive Feature Elimination in the Field of Compound Limb Motor Imagery BCI

Abstract

Compound limb motor imagery brain-computer interface (CLMI-BCI) has better rehabilitative potential after stroke than traditional motor imagery brain-computer interface (MI-BCI), because of its high complexity of instructions. However, it's ability of using for clinical is limited due to the low recognition accuracy. To solve this problem, a new method named Riemann kernel support vector machine recursive feature elimination (RKSVM-RFE) is proposed based on the manifold information on electroencephalogram (EEG). The EEG data of 10 subjects are collected when they were imagining 7-class movements of different parts of the body. The data is modeled using RKSVM-RFE to recognize the motor intention corresponding to the EEG data. Results show that accuracy from our method is about 7% higher than the state-of-the-art method named CSP. And RKSVM-RFE can reduce complexity of system because it can decrease 50% EEG channels. The research provides a new idea about the development of rehabilitation technology based on MI-BCI, which is worthy of further development.