2026-04-17T09:12:07Zhttps://repository.lib.bcit.ca/oai/requestoai:repository.lib.bcit.ca:node-14602025-05-07T21:54:44Znode:32oai_pmh:all_repository_itemsBrain-computer interface design for asynchronous control applications: improvements to the LF-ASD asynchronous brain switch
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.,Peer reviewed,Published. Manuscript received June 30, 2003; revised February 6, 2004.
2004
ISSN: 1558-2531
doi: 10.1109/TBME.2004.827078
accessnum: 7981878
pmc: 15188869
English
Borisoff, Jaimie
Mason, Steven G.
Bashashati, Ali
Birch, Gary, E.
IEEE
Text
© 2004 IEEE
Assistive technology
Brain-computer interfaces