A neuromuscular plasticity apparatus is utilized to exercise a stretch reflex circuit which can reduce tremors and improve balance. The apparatus drives a user's extremity at a frequency to emulate the tremor. An apparatus includes a user interface that may be driven in a rotational and/or linear motion by an electric motor. The user interface may rotate about a rotational axis by a coupler bit that is interchangeable to change the offset distance. The motion may be set to substantially the same as the tremor frequency. A user engages with the user interface to drive an extremity, such as an arm, leg or head to reduce the severity of the tremor and/or improve balance. Muscle tone is improved and tremor is suppressed for a protracted period. The apparatus may be used to exercise and improve balance reflex circuits, the principle difference being the sensory neurons that are stimulated.
