An Efficient P300-Based BCI Using Wavelet Features and IBPSO-Based Channel Selection

Abstract

We present a novel and e±cient scheme that selects a minimal set of effective features and channels for detecting the P300 component of the event-related potential in the brain-computer interface (BCI) paradigm. For obtaining a minimal set
of effective features, we take the truncated coe±cients of discrete Daubechies 4 wavelet, and for selecting the effective EEG channels, we utilize an improved binary particle
swarm optimization algorithm (IBSPO) together with the Bhattacharyya criterion. We tested our proposed scheme on dataset IIb of BCI competition 2005 and achieved
97.5% and 74.5% accuracy in 15 and 5 trials, respectively, using a simple classiffication algorithm based on Bayesian linear discriminant analysis (BLDA). We also tested our
proposed scheme on Hoffmann's dataset for eight subjects, and achieved similar results.