Incurrence and alterations in contralateral tinnitus following monaural exposure to a pure tone

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Abstract
A subject who had a tinnitus with 10,000-Hz pitch equivalent in the left ear no tinnitus in the right ear was exposed in the left ear to a steady tone of 2000 Hz, 107 dB SPL [sound pressure level] for 10 min. This exposure resulted in a permanent tinnitus in both ears with similar pitch of .apprx. 10,000 Hz and loudness of 50-55 SPL (5-10 dB SL [sound level]). When the left ear of this subject was exposed to a steady 500-Hz pure tone at 121 dB SPL for 21 min, tinnitus disappeared temporarily from the stimulated ear but was heard in the nonstimulated ear. In the left ear: 3 h after stimulation, tinnitus reappeared as a mixture of multiple pitches superimposed upon broadband noise and/or low-pass filtered noise; 24 h after stimulation, tinnitus pitch changed to 3260 Hz, 2 days later to 5100 Hz, 3 days later to 8310 Hz and 1 wk later to the original 10,000 Hz and has remained there since. In the nonstimulated right ear: immediately after cessation of stimulation, tinnitus pitch was 6700-800 Hz for 48 h; tinnitus has been fluctuating between 8000-9000-Hz tone and a narrow-band noise centered around 7986 Hz with a bandwidth of 2710 Hz; the tinnitus did not return to the previous pre-exposure pitch of 10,000 Hz until about 4 wk after exposure. These contralateral effects of tinnitus may be mediated by the central auditory system.

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