Frequency patterns of TTS for different exposure intensities

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Abstract
Temporary threshold shift (TTS) was measured for several different test frequencies following exposure to a 2500-Hz tone. The intensity of the exposure tone was varied from 82 to 97 dB SPL [sound perception level]; its duration was 5 or 10 min. In each post-exposure session, TTS was followed for 4 test frequencies using a method of adjustment. In all cases, the center of balance of the TTS pattern moved upward in frequency as exposure intensity increased. This outcome in consistent with the idea of a basalward migration of the traveling-wave envelope with increasing exposure intensity, but the evidence is not unequivocal.

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