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|United States Patent||5,649,061|
|Smyth||July 15, 1997|
A device and method for estimating a mental decision to select a visual cue from the viewer's eye fixation and corresponding single event evoked cerebral potential. The device comprises an eyetracker, an electronic biosignal processor and a digital computer. The eyetracker determines the instantaneous viewing direction from oculometric measurements and a head position and orientation sensor. The electronic processor continually estimates the cerebral electroencephalogramic potential from scalp surface measurements following corrections for electrooculogramic, electromyogramic and electrocardiogramic artifacts. The digital computer analyzes the viewing direction data for a fixation and then extracts the corresponding single event evoked cerebral potential. The fixation properties, such as duration, start and end pupil sizes, end state (saccade or blink) and gaze fixation count, and the parametric representation of the evoked potential are all inputs to an artificial neural network for outputting an estimate of the selection interest in the gaze point of regard. The artificial neural network is trained off-line prior to application to represent the mental decisions of the viewer. The device can be used to control computerized machinery from a video display by ocular gaze point of regard alone, by determining which visual cue the viewer is looking at and then using the estimation of the task-related selection as a selector switch.
|Inventors:||Smyth; Christopher C. (Fallston, MD)|
|Assignee:||The United States of America as represented by the Secretary of the Army (Washington, DC)|
|Filed:||May 11, 1995|
|Current U.S. Class:||706/16; 250/221; 351/210; 706/23|
|Intern'l Class:||A61B 003/14; A61B 005/05|
|Field of Search:||128/731,745 351/218,209 395/20|
|4648052||Mar., 1987||Friedman et al.|
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