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Brain-computer interface design for asynchronous control applications: improvements to the LF-ASD asynchronous brain switch
- Source :
- IEEE Transactions on Biomedical Engineering. June, 2004, Vol. 51 Issue 6, p985, 8 p.
- Publication Year :
- 2004
-
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. Index Terms--Assistive technology, asynchronous control, brain-computer interface (BCI), intermittent control, neuroprosthesis, pattern recognition, statistical signal processing.
Details
- Language :
- English
- ISSN :
- 00189294
- Volume :
- 51
- Issue :
- 6
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Biomedical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.117922557