title: Faster self-organizing fuzzy neural network training and a hyperparameter analysis for a brain-computer interface.
abstract: This paper introduces a number of modifications to the learning algorithm of the self-organizing fuzzy neural network (SOFNN) to improve computational efficiency. It is shown that the modified SOFNN favorably compares to other evolving fuzzy systems in terms of accuracy and structural complexity. An analysis of the SOFNN's effectiveness when applied in an electroencephalogram (EEG)-based brain-computer interface (BCI) involving the neural-time-series-prediction-preprocessing (NTSPP) framework is also presented, where a sensitivity analysis (SA) of the SOFNN hyperparameters was performed using EEG data recorded from three subjects during left/right-motor-imagery-based BCI experiments. The aim of this one-time SA was to eliminate the need to choose subject- and signal-specific hyperparameters for the SOFNN and thus apply the SOFNN in the NTSPP framework as a parameterless self-organizing framework for EEG preprocessing. The results indicate that a general set of NTSPP parameters chosen via the SA provide the best results when tested in a BCI system. Therefore, with this general set of SOFNN parameters and its self-organizing structure, in conjunction with parameterless feature extraction and linear discriminant classification, a fully parameterless BCI that lends itself well to autonomous adaptation is realizable.
authors.affiliation: Intelligent Systems Research Center, School ofComputing and Intelligent Systems, Faculty of Computing and Engineering,University of Ulster, Londonderry, U.K. dh.coyle@ulster.ac.uk
authors.forename: Damien
authors.initials: D
authors.lastname: Coyle
authors.forename: Girijesh
authors.initials: G
authors.lastname: Prasad
authors.forename: Thomas Martin
authors.initials: TM
authors.lastname: McGinnity
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D001921:Brain / Q000502:physiology; D004569:Electroencephalography / Q000379:methods; D017143:Fuzzy Logic; D006801:Humans; D008328:Man-Machine Systems; D016571:Neural Networks, Computer; D012815:Signal Processing, Computer-Assisted; D014584:User-Computer Interface