Low-quality training data detection method of EEG signals for motor imagery BCI system

• Published in: Journal of neuroscience methods Vol. 376; p. 109607
• Main Authors: Ouyang, Rui, Jin, Zihao, Tang, Shuhao, Fan, Cunhang, Wu, Xiaopei
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.07.2022
• Subjects: Brain computer interface (BCI); Electroencephalogram (EEG); Independent component analysis (ICA); Motor imagery (MI); Motor imagery (MI); Electroencephalogram (EEG); Independent component analysis (ICA); Brain computer interface (BCI)
• ISSN: 0165-0270; 1872-678X; 1872-678X
• DOI: 10.1016/j.jneumeth.2022.109607

The design and implementation of high-performance motor imagery-based brain computer interface (MI-BCI) requires high-quality training samples. However, fluctuation in subjects’ physiological and mental states as well as artifacts can produce the low-quality motor imagery electroencephalogram (EEG) signal, which will damage the performance of MI-BCI system. In order to select high-quality MI-EEG training data, this paper proposes a low-quality training data detection method combining independent component analysis (ICA) and weak classifier cluster. we also design and implement a new online BCI system based on motor imagery to verify the online processing performance of the proposed method. In order to verify the effectiveness of the proposed method, we conducted offline experiments on the public dataset called BCI Competition IV Data Set 2b. Furthermore, in order to verify the processing performance of the online system, we designed 60 groups of online experiments on 12 subjects. The online experimental results show that the twelve subjects can complete the system task efficiently (the best experiment is 135.6 s with 9 trials of subject S1). This paper demonstrated that the proposed low-quality training data detection method can effectively screen out low-quality training samples, so as to improve the performance of the MI-BCI system. •A low-quality data detection method is proposed to screen low-quality training samples caused by different factors.•The possibility of reusing low-quality samples is studied.•An online asynchronous MI-BCI system is designed and implemented.