Detection of Hand Extension Movements in the Context of a 3-State Asynchronous Brain Interface

TitleDetection of Hand Extension Movements in the Context of a 3-State Asynchronous Brain Interface
Publication TypeConference Paper
Year of Publication2006
AuthorsBashashati, A., R. K. Ward, and G. E. Birch
Conference NameAcoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
PaginationV -V
Date Publishedmay.
Keywords2-state LF-ASD, 3-state asynchronous brain interface, direct brain interface, EEG, electroencephalography, error characteristics, false positive rates, finger movement, hand extension movement detection, low-frequency asynchronous switch design, medical signal detection, system-defined periods

The low-frequency asynchronous switch design (LF-ASD) is a direct brain interface (BI) that detects the presence of a specific finger movement in the ongoing EEG. Asynchronous interfaces have the advantage of being operational at all times and not only at specific system-defined periods. In this paper, we present the design of a 3-state asynchronous BI for the detection of two different movements from the ongoing EEG. The proposed 3-state asynchronous BI detects right and left hand extensions. Using data collected from two able-bodied individuals, it is shown that the error characteristics of the new system in detecting the presence of movement are significantly better than the 2-state LF-ASD, with true positive rate increases of up to 22.4% for false positive rates in the 1-2% range. An average performance of 61.5% was achieved in differentiating between left and right hand movements


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