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Tinnitus induced by tones.

Noisy sounding tinnitus was induced in 11 normally hearing subjects following monaural presentation of intense pure tones. The sensation level of a comparison noise, matched in loudness to the tinnitus by the subjects, was found to increase first rapidly and then slowly before dying away within about 90 s. The peak level of the tinnitus increased with the level of the inducing tone but was unaffected by its duration or frequency; the duration of the tinnitus was positively related to the frequency but not to the level or duration of the tone. Temporary threshold shift measured with pulsed noise generally occurred after, rather than during, the tinnitus. Substantial individual differences, particularly in the duration of the tinnitus, were apparent.