Common Spatial Pattern with L21-Norm
Gu, Jingyu1; Wei, Mengting2; Guo, Yiyun3; Wang, Haixian1
First AuthorGu, Jingyu
Contribution Rank3

As one of the most commonly used algorithms in the field of feature extraction, common spatial pattern (CSP) has a good effect on multichannel electroencephalogram (EEG) signal classification, especially for motor imagery-based signals. However, the formulation of the conventional CSP based on the L2-norm is sensitive to outliers. Whereas the L1-norm-based common spatial pattern (CSP-L1) proposed in recent years can seek robust spatial filters to effectively alleviate the impact of outliers, the L1-norm is unable to characterize the geometric structure of the data well. To further improve the robustness of CSP, in this paper, we propose a new extension to CSP called the L21-norm-based common spatial pattern (CSP-L21), which is formulated by using the L21-norm rather than the L2-norm. Moreover, CSP-L21 has the advantages of rotational invariance and geometric structure characterization. We provide a non-greedy iterative algorithm to maximize the objective function of CSP-L21. Experiments on a toy example and three popular data sets of BCI competitions illustrate that the proposed method can efficiently extract discriminative features.

KeywordBrain-computer interfaces (BCI) Common spatial pattern (CSP) L21-norm Robust feature extraction
Indexed ByEI
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Document Type期刊论文
Affiliation1.Southeast Univ, Sch Biol Sci & Med Engn, Key Lab Child Dev & Learning Sci, Minist Educ, Nanjing 210096, Jiangsu, Peoples R China
2.Qingdao Port Int Co Ltd, Qingdao 266011, Shandong, Peoples R China
3.Chinese Acad Sci, Inst Psychol, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Gu, Jingyu,Wei, Mengting,Guo, Yiyun,et al. Common Spatial Pattern with L21-Norm[J]. NEURAL PROCESSING LETTERS,2021.
APA Gu, Jingyu,Wei, Mengting,Guo, Yiyun,&Wang, Haixian.(2021).Common Spatial Pattern with L21-Norm.NEURAL PROCESSING LETTERS.
MLA Gu, Jingyu,et al."Common Spatial Pattern with L21-Norm".NEURAL PROCESSING LETTERS (2021).
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