Sensory feedback therapy may significantly improve the function of neurologic patients with disorders of voluntary movement, including torticollis, dystonia, and hemiparetic-spastic disorders of varied etiology. Thirty-six consecutively selected patients were studied, most of whom had received conventional therapy for up to 25 years with limited or no improvement. The patients learned volitional control of the functionally defective muscle group by means of audiovisual displays of integrated myoelectric activity from the monitored muscles. As volitional control of motor activity was achieved, the exteroceptive feedback was gradually withdrawn. Thirty-two of the patients responded with varying degrees of improvement ranging from functional "recovery" to symptomatic relief within 8 to 12 weeks. Apparently, a significant number of patients with disrupted internal feedback loops can incorporate the learned movement pattern by using those components of neuromuscular system that are still functionally available.