A brain-controlled switch for asynchronous control applications

TitleA brain-controlled switch for asynchronous control applications
Publication TypeJournal Article
Year of Publication2000
AuthorsMason, S. G., and G. E. Birch
JournalIEEE Transactions on Biomedical Engineering

Asynchronous control applications are an important class of application that has not received much attention from the brain-computer interface (BCI) community, This work provides a design for an asynchronous BCI switch and performs the first extensive evaluation of an asynchronous device in attentive, spontaneous electroencephalographic (EEG), The switch design [named the low-frequency asynchronous switch design (LF-ASD)] is based on a new feature set related to imaginary movements in the 1-4 Hz frequency range. This new feature set was identified from a unique analysis of EEG using a bi-scale wavelet. Offline evaluations of a prototype switch demonstrated hit (true positive) rates in the range of 38%-81% with corresponding false positive rates in the range of 0.3%-11.6%, The performance of the LF-ASD was contrasted with two other ASDs: one based on mu-power features and another based on the outlier processing method (OPM) algorithm, The minimum mean error rates for the LF-ASD were shown to be significantly lower than either of these other two switch designs.

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