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Dr. Levine is an experimental physicist with a specialty in instrumentation. "That's exactly what this problem required - measuring something when there is the noise of hand tremor - so it was natural to think of applying a digital filter," he said.
To test the device, Dr. Levine called on Cathy Bodine, who directs a program at the University of Colorado School of Medicine in Denver that works with people with disabilities. Dr. Bodine contacted a local tremor group as well as a national support group to recruit people who could identify crucial properties they wanted in the prototype, and then test these properties.
"The participants had to click on buttons on the screen," she said, opening and closing programs, as well as drawing the letter X with the device, both with the filter on and off. "There was a huge difference between using the filter with battery like dell 8649R battery , dell Inspiron 700m battery , dell Inspiron 710m battery , dell G5345 battery , dell Inspiron 8600 battery , dell Latitude D800 battery , dell Precision M60 battery , dell Inspiron 9100 battery , dell H5559 battery , dell Latitude D830 battery , dell Latitude D820 battery , dell Precision M65 battery and not using it."
Meanwhile, in England, Mr. Cosgrave was trying to find a solution to his own difficulties with a computer mouse. Mr. Cosgrave, a retired airline pilot who continues to fly a small airplane, said his tremor had not interfered with his abilities in the cockpit. "But it causes the cursor on my computer to dance around the screen with a mind of its own," he said.
Dr. Bodine says people have been calling since the trials, asking when the mouse will be on the market. "The results of our tests showed that it helped people, minimizing the impact of tremor on the use of the computer," she said.
No additional software is required with the device, called an Assistive Mouse Adapter.
Richard F. Doherty, research director of the Envisioneering Group in Seaford, N.Y., said the I.B.M. device was highly promising. "We have ultraprecision mice for video gamers and for graphics designers laying out movie special effects," he said, but only limited choices in adaptations of mouse controls for people with tremors. Some options, like eye tracking, are relatively cumbersome and expensive. "There's nothing as adaptable and robust as this solution," he said. "It's rugged enough to handle a wide degree of motor skills disorders."