Abstract
We examined the effectiveness of masking therapy for tinnitus by measuring the residual inhibition (RI) induced by acoustic stimuli from a commercial music synthesizer, as well as by pure tone and band noise.A personal computer was used to control the music synthesizer. Parameters concerning RI analyzed were masking loudness, masking instrument (sound generator) and duration of RI after repetition.The music synthe s izer was the most effective sound source for masking, except in patients who showed fatigue of masking by repetition test. Masker therapy was effective in 47% of the patients with tinnitus caused by various kinds of ear disease. Tinnitus with a small minimum masking level and with long RI was inhibited effectively by masking therapy.Side effects of masking therapy, noted in 20% of the patients were increase of tinnitus, hearing impairment and headache.
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