Motor Imagery Classification Emphasizing Corresponding Frequency Domain Method based on Deep Learning Framework
This work addresses the problem of decoding motor imagery for brain-computer interface (BCI) device control, offering an incremental step towards practical applications.
This paper proposes a deep learning framework using power spectral density to classify 3-class motor imagery data from the 2020 International BCI competition dataset. The method achieved an average classification performance of 69.68% in intra-session conditions and 52.76% in inter-session conditions.
The electroencephalogram, a type of non-invasive-based brain signal that has a user intention-related feature provides an efficient bidirectional pathway between user and computer. In this work, we proposed a deep learning framework based on corresponding frequency empahsize method to decode the motor imagery (MI) data from 2020 International BCI competition dataset. The MI dataset consists of 3-class, namely 'Cylindrical', 'Spherical', and 'Lumbrical'. We utilized power spectral density as an emphasize method and a convolutional neural network to classify the modified MI data. The results showed that MI-related frequency range was activated during MI task, and provide neurophysiological evidence to design the proposed method. When using the proposed method, the average classification performance in intra-session condition was 69.68% and the average classification performance in inter-session condition was 52.76%. Our results provided the possibility of developing a BCI-based device control system for practical applications.