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Deep learning for BCI application

Keywords:

F.V. Stankevich – Post-graduate Student, Tomsk Polytechnical University E-mail: stankevichfv@tpu.ru V.G. Spitsyn – Dr.Sc. (Eng.), Professor, Tomsk Polytechnical University E-mail: spvg@tpu.ru


Deep learning methods became quite popular over the last years [2]. They allowed us significantly improve recognition accuracy in different fields [3], [4]. In this work we aimed to evaluate deep learning approach for classification of physiological signals. To be more specific our goal is to classify electroencephalography signal in brain-computer interface (BCI) system. There are several types of BCI systems. In this work we focused on BCI systems based on motor imagery. We used Data Set 2a from BCI Competition IV (Berlin, 2008) to evaluate the classification accuracy. This data set has 4 classes. In the experiment participated 9 subjects, from each subject 576 trials were recorded. Half of the trials were used to train the classifier and other half of them were used to evaluate the classifier performance. The resulted deep convolutional neural network had 7 main layers. As the input for the neural network we used Fourier spectrum of the signal. The network performance achieved on the data set was 0.8467 (kappa value). This performance exceeds the known to the authors methods. The computational complexity of the classification process is acceptable is to use the classifier in real time.
References:

 

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