A comparison of classification techniques for a gaze-independent P300-based brain-computer interface

This off-line study aims to assess the performance of five classifiers commonly used in the brain-computer interface (BCI) community, when applied to a gaze-independent P300-based BCI. In particular, we compared the results of four linear classifiers and one nonlinear: Fisher's linear discrimin...

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Bibliographic Details
Published in:Journal of neural engineering Vol. 9; no. 4; p. 045012
Main Authors: Aloise, F, Schettini, F, Aricò, P, Salinari, S, Babiloni, F, Cincotti, F
Format: Journal Article
Language:English
Published: England 01.08.2012
Subjects:
Adult
Brain-Computer Interfaces - classification
Electroencephalography - classification
Electroencephalography - methods
Event-Related Potentials, P300 - physiology
Female
Fixation, Ocular - physiology
Humans
Male
Photic Stimulation - methods
Young Adult
ISSN:1741-2552, 1741-2552
Online Access:Get more information
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Summary:This off-line study aims to assess the performance of five classifiers commonly used in the brain-computer interface (BCI) community, when applied to a gaze-independent P300-based BCI. In particular, we compared the results of four linear classifiers and one nonlinear: Fisher's linear discriminant analysis (LDA), stepwise linear discriminant analysis (SWLDA), Bayesian linear discriminant analysis (BLDA), linear support vector machine (LSVM) and Gaussian supported vector machine (GSVM). Moreover, different values for the decimation of the training dataset were tested. The results were evaluated both in terms of accuracy and written symbol rate with the data of 19 healthy subjects. No significant differences among the considered classifiers were found. The optimal decimation factor spanned a range from 3 to 24 (12 to 94 ms long bins). Nevertheless, performance on individually optimized classification parameters is not significantly different from a classification with general parameters (i.e. using an LDA classifier, about 48 ms long bins).
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ISSN:1741-2552
1741-2552
DOI:10.1088/1741-2560/9/4/045012