A combined feature extraction method for left-right hand motor imagery in BCI

The aim of BCI is to translate brain activity into a command for a computer. For this purpose, the EEG signal processing plays an important role, especially in feature extraction. In this paper, a combined feature extraction method is proposed for left-right hand motor imagery in BCI. The power in the sensorimotor rhythm band and the statistical features of wavelet coefficients are used for extracting features and support vector machine is adopted for pattern recognition of left-right hand motor imagery. The performance is tested by the EEG signals of subject b and subject g from the datasets1 BCI Competition IV. The results have shown the availability of this method. It provides a novel way to EEG feature extraction in BCI.