The tests were performed in random order, except the balance tests, which were administered last to avoid upsetting the sensor-screen calibration for the pointing tasks.  Prior to each subject’s arrival, the motion capture controller was calibrated for the ambient lighting and its relative position to the computer screen. Upper limb movements were performed on each side. The entire assessment lasted no more than 2 hours. Administration of the QMA and conventional tests were conducted according to established protocols [Kincaid, et al.][2], [3][1]; however a brief description of each test and its administration is included here. 
For all but the balance tests, participants sat square at a table in front of a computer screen. The motion capture sensor sat on the table, face up, in front of the computer screen. Participants were introduced to the motion capture controller by observing how their hand was tracked in a visualizer window on the computer screen (Figure 1). As they watched, they were instructed to keep their hand approximately 25 cm directly above the controller as much as possible for optimal tracking during each of the QMA tests (Figure 2A). Position in three dimensions and velocity of the finger tips and palm were recorded by the Leap Motion sensor at approximately 100 samples per second. During the conventional tests that required sitting, participants moved to an adjacent table. In the last test the sensor was mounted on a tripod to record the movement of two wooden dowels which were attached to a helmet worn by the participant (Figure 2B). During that time, an iPod used for the NIH balance tests was attached to belt around the participant’s waist, so data for both balance tests were collected simultaneously.