EMG biofeedback in the modification of hypertonia in spastic dysarthria: case report

A 22-year-old man with severe spastic dysarthria resulting from head trauma was unable to achieve mandibular closure despite traditional treatment methods. It was decided to apply the principles of electromyographic (EMG) neuromuscular re-education to increase awareness of generalized tension of the facial muscles involved in depression and elevation of the mandible. With a planned program of auditory feedback of muscle action potential, the patient displayed rapid improvement in monitoring muscle tension and achieving mandibular closure. These gains were maintained after discontinuation of biofeedback.