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A Personalized Feature Extraction and Classification Method for Motor Imagery Recognition

Abstract

In practical applications of the motor imagery-based brain–computer interface (BCI) system, the differences in electroencephalogram (EEG) signal manifestation and corresponding rhythm ranges in different individuals pose a significant challenge. The corresponding EEG features in different frequency bands differ; therefore, personalized screening must be conducted to obtain information that is conducive to the classification of EEG signals for different motor imageries. Also, in current BCI system, to obtain more information, multi-channel electrodes are often used to collect EEG signals, but also increasing the complexity of calculation. In this paper, a personalized feature extraction method based on filter bank and elastic net and a personalized channel selection based on Deep Belief Network to obtain a classification accuracy similar to or even higher than using all channels is proposed. Compared with the typically used feature extraction and classification algorithms, this method obtains higher calculation rates and recognition accuracy and provides a theoretical reference for the practical application of BCI systems. The shortcomings of the common spatial pattern (CSP) algorithm are addressed. The major contribution of this paper is the flexible screening of feature vectors and channels containing more classification information based on individual differences, thereby preventing the manual adjustment of specific frequency ranges in traditional CSP for performing feature extraction and avoiding inputting all channels. In the case study, the highest test accuracy reaches 86.94%.

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Acknowledgments

Wang was supported in part by Shanghai Science and Technology Commission Project, under project number 19511105202. Yao was supported in part by Minister of Science and Technology, ROC, under project number MOST 108-2221-E-007-068-MY3.

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Correspondence to Yuan Yao.

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Wang, JG., Shao, HM., Yao, Y. et al. A Personalized Feature Extraction and Classification Method for Motor Imagery Recognition. Mobile Netw Appl 26, 1359–1371 (2021). https://doi.org/10.1007/s11036-021-01754-0

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Keywords

  • Brain computer Interface (BCI)
  • Motor imagery
  • Elastic net
  • Feature extraction
  • Deep belief network (DBN)