A method and apparatus are described for interacting with electronic
devices through motional commands. The method uses perturbations of the
background quasistatic electric fields. The apparatus measures
perturbations in electric potential relative to the background. Body
movement is recognized by comparing changes in signals over time. Signals
collected from sensors are compared with training sets to recognize
specified motional commands or gestures. Upon recognizing the commands,
the apparatus issues the predetermined response to the motion.