A temporary threshold shift (TTS) is a temporary increase in the auditory threshold after exposure to threatening noise levels. A shift of 10–40 dB may last from a few minutes to a few days, depending on the exposure level and duration. Muffled hearing, a feeling of fullness, and tinnitus may accompany TTS; tinnitus is a symptom rather than the threshold shift itself.

State University of New York at Buffalo

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Encountering threatening noise levels could lead to experiencing a TTS of 10-40dB that lasts from a few minutes to a few days depending on exposure level and duration. There have been fewer concerns about TTS, however, recently, Kujawa and Liberman have discovered long-term consequences of TTS in mice, caused by exposure to 8-16 kHz band of noise at 100dB for 2 hours. There was an acute loss of the inner hair cell ribbon synapses connected to the degeneration of auditory nerve fibers. Which follows over the course of a lifetime. 


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