Numerous studies have shown that feedback of neuromuscular activity from the masticatory muscles
(jaw, pterygoids, etc.) reduces activity, tension, and pain from these muscles. It is not clear whether the muscle feedback helps reduce muscle activity or simply relaxes the whole muscle system, but the end result is positive. EMG sensors are placed on the jaw muscles and the patient is rewarded for reductions in activity. This is usually accomplished by setting a goal (called a threshold) and supplying feedback (auditory or visual) when the activity in the jaw muscles is reduced below the threshold.
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