Feature Extraction and Recognition of Motor Imagery EEG Based on EMD-Multiscale Entropy and Extreme Learning Machine
1 Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
2 Department of Rehabilitation, Qinhuangdao People's Hospital, Qinhuangdao 066000, China
Abstract：Brain electrical rhythms features of motor imagery are an important basis to recognize the movement patterns and realize the biofeedbackbased rehabilitation therapy. Based on the recognition method of contralateral motion imagery EEG, the feature extraction method for unilateral motion imagery EEG in different patterns was studied in this paper. A new method based on EMD-multiscale entropy (MSE) was proposed to quantitatively describe the EEG transient feature, and a movement pattern recognition model based on extreme learning machine was designed. Furthermore, the present method was tested with the EEG data from 10 healthy subjects performing the flexion and extension motion of unilateral arm, and the validity of the proposed method was verified by the analysis of EEG feature extraction and movement recognition, and the recognition rate was higher than 90%. It is revealed that the EMD-MSE method can quantitatively describe the EEG transient feature under different patterns, and furthermore, the ELM based on feed forward neural network can recognize the movement patterns.
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