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electromyograph

An electronic biofeedback device which monitors muscle activity via electrodes taped to the skin. The user sees how tense or relaxed the particular muscle is via a row of colored lights, or by listening to a series of beeps. Designed to assist muscle relaxation.
Credit

Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)