Abstract
For a subject with binaural tinnitus pitch 10 000 Hz, loudness 50 dB SPL, left ear was stimulated by a continuous pure tone 250 Hz, 125 dB SPL, 30 min. Immediately following cessation of stimulation, tinnitus completely disappeared from stimulated ear. Twenty-three min after cessation of stimulation, tinnitus was heard as a pitch 12 445 Hz. One h after stimulation, tinnitus pitch changed to 12 131 Hz; 2 h later, 11 000 Hz; 312 h later, 10 953 Hz; 5 h later returned to original pitch 10 000 Hz and stayed on to date. For a period of 23 h after stimulation, however, stimulated ear continuously heard multiple frequency tones approximately 200–800 Hz. In nonstimulated ear, immediately after cessation of stimulation, tinnitus was heard as a pitch 5000 Hz and gradually increased in pitch to 7500 Hz for 312 h. Thereafter, tinnitus pitch has been fluctuating between 9000–10 000 Hz. Tinnitus never returned to previous pitch 10 000 Hz until 16 days after stimulation. Apparent differences in recovery pattern and process between two ears were compared with a previous experiment of 500-Hz monaural stimulation.
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