An improved asynchronous brain interface: making use of the temporal history of the LF-ASD feature vectors

TitleAn improved asynchronous brain interface: making use of the temporal history of the LF-ASD feature vectors
Publication TypeJournal Article
Year of Publication2006
AuthorsBashashati, A., S. Mason, R. K. Ward, and G. E. Birch
JournalJ Neural Eng
Volume3
Pagination87-94
Date PublishedJun
Abstract

The low-frequency asynchronous switch design (LF-ASD) has been introduced as a direct brain interface (BI) for asynchronous control applications. Asynchronous interfaces, as opposed to synchronous interfaces, have the advantage of being operational at all times and not only at specific system-defined periods. This paper modifies the LF-ASD design by incorporating into the system more knowledge about the attempted movements. Specifically, the history of feature values extracted from the EEG signal is used to detect a right index finger movement attempt. Using data collected from individuals with high-level spinal cord injuries and able-bodied subjects, it is shown that the error characteristics of the modified design are significantly better than the previous LF-ASD design. The true positive rate percentage increased by up to 15 which corresponds to 50% improvement when the system is operating with false positive rates in the 1-2% range.

URLhttp://dx.doi.org/10.1088/1741-2560/3/2/002
DOI10.1088/1741-2560/3/2/002

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