Classifying single-trial EEG during motor imagery by iterative spatio-spectral patterns learning (ISSPL).

Full Abstract

In most current motor-imagery-based brain-computer interfaces (BCIs), machine learning is carried out in two consecutive stages: feature extraction and feature classification. Feature extraction has focused on automatic learning of spatial filters, with little or no attention being paid to optimization of parameters for temporal filters that still require time-consuming, ad hoc manual tuning. In this paper, we present a new algorithm termed iterative spatio-spectral patterns learning (ISSPL) that employs statistical learning theory to perform automatic learning of spatio-spectral filters. In ISSPL, spectral filters and the classifier are simultaneously parameterized for optimization to achieve good generalization performance. A detailed derivation and theoretical analysis of ISSPL are given. Experimental results on two datasets show that the proposed algorithm can correctly identify the discriminative frequency bands, demonstrating the algorithm's superiority over contemporary approaches in classification performance.

Author information

Author/s: Wu, Wei (W); Gao, Xiaorong (X); Hong, Bo (B); Gao, Shangkai (S);

Affiliation: Department of Biomedical Engineering, Tsinghua University, Beijing 100084, China. wuwei03(-atsign-)mails.tsinghua.edu.cn

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: IEEE transactions on bio-medical engineering (IEEE Trans Biomed Eng), published in United States. (Language: eng)

Reference: 2008-Jun; vol 55 (issue 6) : pp 1733-43

Dates: Created 2008/08/21; Completed 2008/09/17;

PMID: 18714838, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

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