title: Electroencephalographic(EEG)-based communication: EEG control versus system performance in humans.
abstract: People can learn to control electroencephalographic (EEG) sensorimotor rhythm amplitude so as to move a cursor to select among choices on a computer screen. We explored the dependence of system performance on EEG control. Users moved the cursor to reach a target at one of four possible locations. EEG control was measured as the correlation (r(2)) between rhythm amplitude and target location. Performance was measured as accuracy (% of targets hit) and as information transfer rate (bits/trial). The relationship between EEG control and accuracy can be approximated by a linear function that is constant for all users. The results facilitate offline predictions of the effects on performance of using different EEG features or combinations of features to control cursor movement.
authors.affiliation: Laboratory of Nervous System Disorders, Wadsworth Center, New York State Department of Health and State University of New York, Empire State Plaza, Albany, NY 12201, USA. sheikh@wadsworth.org
authors.forename: Hesham
authors.initials: H
authors.lastname: Sheikh
authors.forename: Dennis J
authors.initials: DJ
authors.lastname: McFarland
authors.forename: William A
authors.initials: WA
authors.lastname: Sarnacki
authors.forename: Jonathan R
authors.initials: JR
authors.lastname: Wolpaw
mesh_terms: D001676:Biofeedback, Psychology; D003143:Communication Devices for People with Disabilities; D004569:Electroencephalography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009069:Movement Disorders / Q000534:rehabilitation; D009862:Online Systems / Q000295:instrumentation; D011237:Predictive Value of Tests; D011930:Reaction Time; D012680:Sensitivity and Specificity; D013003:Somatosensory Cortex / Q000502:physiology; D014584:User-Computer Interface