Decay of Temporary Threshold Shift in Noise

Author:

Mills John H.1,Talo Seija A.1,Gordon Gloria S.1

Affiliation:

1. Central Institute for the Deaf, St. Louis, Missouri

Abstract

Groups of monaural chinchillas trained in behavioral audiometry were exposed in a diffuse sound field to an octave-band noise centered at 4.0 k Hz. The growth of temporary threshold shift (TTS) at 5.7 k Hz from zero to an asymptote (TTS ) required about 24 hours, and the growth of TTS at 5.7 k Hz from an asymptote to a higher asymptote, about 12–24 hours. TTS can be described by the equation TTS = 1.6(SPL-A) where A = 47. These results are consistent with those previously reported in this journal by Carder and Miller and Mills and Talo. Whereas the decay of TTS to zero required about three days, the decay of TTS to a lower TTS required about three to seven days. The decay of TTS in noise, therefore, appears to require slightly more time than the decay of TTS in the quiet. However, for a given level of noise, the magnitude of TTS is the same regardless of whether the TTS asymptote is approached from zero, from a lower asymptote, or from a higher asymptote.

Publisher

American Speech Language Hearing Association

Subject

Otorhinolaryngology

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