About 40 years ago a University of Houston and University of Texas Medical School Professor of Psychology, Dr. Daniel E. Sheer, developed a similar system. The result: an Apple II game system for use by patients with brain damage or dysfunction to retrain the fine control of their hands. Several systems were installed in Houston area hospitals as a result of the work.

The system was adjustable to the user's tremors and had a number of parameters to adjust the "smoothness" and responsiveness of the cursor. It worked with both joystick and mouse, as I recall.