Int J Neural Syst - Aggregation of sparse linear discriminant analyses for event-related potential classification in brain-computer interface.

Tópicos

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{ perform(999) metric(946) measur(919) }
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Resumo

Two main issues for event-related potential (ERP) classification in brain-computer interface (BCI) application are curse-of-dimensionality and bias-variance tradeoff, which may deteriorate classification performance, especially with insufficient training samples resulted from limited calibration time. This study introduces an aggregation of sparse linear discriminant analyses (ASLDA) to overcome these problems. In the ASLDA, multiple sparse discriminant vectors are learned from differently l1-regularized least-squares regressions by exploiting the equivalence between LDA and least-squares regression, and are subsequently aggregated to form an ensemble classifier, which could not only implement automatic feature selection for dimensionality reduction to alleviate curse-of-dimensionality, but also decrease the variance to improve generalization capacity for new test samples. Extensive investigation and comparison are carried out among the ASLDA, the ordinary LDA and other competing ERP classification algorithms, based on different three ERP datasets. Experimental results indicate that the ASLDA yields better overall performance for single-trial ERP classification when insufficient training samples are available. This suggests the proposed ASLDA is promising for ERP classification in small sample size scenario to improve the practicability of BCI.

Resumo Limpo

two main issu eventrel potenti erp classif braincomput interfac bci applic curseofdimension biasvari tradeoff may deterior classif perform especi insuffici train sampl result limit calibr time studi introduc aggreg spars linear discrimin analys aslda overcom problem aslda multipl spars discrimin vector learn differ lregular leastsquar regress exploit equival lda leastsquar regress subsequ aggreg form ensembl classifi implement automat featur select dimension reduct allevi curseofdimension also decreas varianc improv general capac new test sampl extens investig comparison carri among aslda ordinari lda compet erp classif algorithm base differ three erp dataset experiment result indic aslda yield better overal perform singletri erp classif insuffici train sampl avail suggest propos aslda promis erp classif small sampl size scenario improv practic bci

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