1. A method of identifying selective motor control associated with motion of a human subject, the method comprising: detecting at least a portion of the motion associated with the human subject; repeatedly analyzing a step response associated with the detected motion to determine a peak time t p , the peak time t p being a time in which a magnitude of the step response reaches a peak; estimating an overshoot magnitude M p , the overshoot magnitude M p being the difference of the magnitude of the step response at the peak time t p and a target magnitude of the step response; and classifying the motion as either a precise selection or as a broad selection based, at least in part, on the overshoot magnitude M p .