Our research seeks to develop an efficient and effective brain-computer interface (BCI) system that will serve as a communication access method for individuals with locked-in syndrome. We strive to improve the accuracy and speed of the technology, as well as user satisfaction, for a system that can be used for functional written and spoken expression.
Basic design of a BCI system for assistive technology control
In BCIs using visual, auditory, or tactile stimuli, a computer selects stimuli to be presented to the user via a presentation device (e.g. display, headphones, or tactors), and the user's reactions produce brain signals. In self-driven BCIs, the user spontaneously produces brain signals;the left-hand portion of the figure (in gray) does not apply in these systems. In either case, the brain signals are processed and digitized by signal acquisition hardware and sent to the computer for analysis. If the computer has sufficient evidence to infer the user's intent, it sends a control command to the AT software or device. If not, it initiates the presentation of additional stimuli to the user, or, in the case of self-driven BCIs, awaits additional information from the user. In many systems, the user simultaneously receives input from the stimulus presentation device and feedback from the AT.
In the video below, Betts Peters, M.A., C.C.C.-S.L.P., discusses Brain-Computer Interfaces.