It's tough identifying Parkinson's disease in its early stages -- there are no standard lab tests to diagnose it and symptoms are subtle. A group of MIT researchers believe the answer could lie in something a lot of people already use: the computer keyboard. They've recently conducted a study proving that people with conditions affecting motor function have different typing patterns than those who don't. To be exact, the researchers designed plug-in software to measure how long subjects pressed each key before releasing it. Those with impaired motor skills ended up pressing keys for a longer duration.