Study of kernel machines towards brain-computer interfaces
Identifieur interne : 000522 ( France/Analysis ); précédent : 000521; suivant : 000523Study of kernel machines towards brain-computer interfaces
Auteurs : Xilan Tian [France]Source :
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Abstract
Brain-computer Interface (BCI) has achieved numerous successful applications in both clinicaldomain and daily life amelioration. As an essential component, signal processing determines markedly the performance of a BCI system. In this thesis, we dedicate to improve the signal processing strategy from perspective of machine learning strategy. Firstly, we proposed TSVM-MKL to explore the inputs from multiple views, namely, from statistical view and geometrical view; Secondly, we proposed an online MKL to reduce the computational burden involved in most MKL algorithm. The proposed algorithms achieve a better classifcation performance compared with the classical signal kernel machines, and realize an automatical channel selection due to the advantages of MKL algorithm. In the last part, we attempt to improve the signal processing beyond the machine learning algorithms themselves. We first confirmed that simple classifier model can also achieve satisfying performance by careful feature (and/or channel) selection in off-line BCI data analysis. We then implement another approach to improve the BCI signal processing by taking account for the user's emotional state during the signal acquisition procedure. Based on the reliable EEG data obtained from different emotional states, namely, positive, negative and neutral emotions, we perform strict evaluation using statistical tests to confirm that the emotion does affect BCI performance. This part of work provides important basis for realizing user-friendly BCIs.
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As an essential component, signal processing determines markedly the performance of a BCI system. In this thesis, we dedicate to improve the signal processing strategy from perspective of machine learning strategy. Firstly, we proposed TSVM-MKL to explore the inputs from multiple views, namely, from statistical view and geometrical view; Secondly, we proposed an online MKL to reduce the computational burden involved in most MKL algorithm. The proposed algorithms achieve a better classifcation performance compared with the classical signal kernel machines, and realize an automatical channel selection due to the advantages of MKL algorithm. In the last part, we attempt to improve the signal processing beyond the machine learning algorithms themselves. We first confirmed that simple classifier model can also achieve satisfying performance by careful feature (and/or channel) selection in off-line BCI data analysis. We then implement another approach to improve the BCI signal processing by taking account for the user's emotional state during the signal acquisition procedure. Based on the reliable EEG data obtained from different emotional states, namely, positive, negative and neutral emotions, we perform strict evaluation using statistical tests to confirm that the emotion does affect BCI performance. 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