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Brain-computer interface design for asynchronous control applications: improvements to the LF-ASD asynchronous brain switch.

Jaimie F Borisoff·Steve G Mason·Ali Bashashati·Gary E Birch
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Abstract

The low-frequency asynchronous switch design (LF-ASD) was introduced as a direct brain-computer interface (BCI) technology for asynchronous control applications. The LF-ASD operates as an asynchronous brain switch (ABS) which is activated only when a user intends control and maintains an inactive state output when the user is not meaning to control the device (i.e., they may be idle, thinking about a problem, or performing some other action). Results from LF-ASD evaluations have shown promise, although the reported error rates are too high for most practical applications. This paper presents the evaluation of four new LF-ASD designs with data collected from individuals with high-level spinal cord injuries and able-bodied subjects. These new designs incorporated electroencephalographic energy normalization and feature space dimensionality reduction. The error characteristics of the new ABS designs were significantly better than the LF-ASD design with true positive rate increases of approximately 33% for false positive rates in the range of 1%-2%. The results demonstrate that the dimensionality of the LF-ASD feature space can be reduced without performance degradation. The results also confirm previous findings that spinal cord-injured subjects can operate ABS designs to the same ability as able-bodied subjects.

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AdultAlgorithmsBrainCommunication Devices for People with DisabilitiesElectroencephalographyEvoked PotentialsFeedbackFemaleHumansInformation Storage and RetrievalMaleMiddle AgedMotor CortexOnline SystemsReproducibility of ResultsSensitivity and SpecificityUser-Computer InterfaceClinical TrialComparative StudyJournal ArticleResearch Support, Non-U.S. Gov'tValidation Study

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Jaimie F Borisoff, Steve G Mason, Ali Bashashati, Gary E Birch. 2004. Brain-computer interface design for asynchronous control applications: improvements to the LF-ASD asynchronous brain switch.. https://doi.org/10.1109/tbme.2004.827078

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