Decay of Temporary Threshold Shift in Noise 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 ... Research Article
Research Article  |   June 01, 1973
Decay of Temporary Threshold Shift in Noise
 
Author Affiliations & Notes
  • John H. Mills
    Central Institute for the Deaf, St. Louis, Missouri
  • Seija A. Talo
    Central Institute for the Deaf, St. Louis, Missouri
  • Gloria S. Gordon
    Central Institute for the Deaf, St. Louis, Missouri
Article Information
Research Articles
Research Article   |   June 01, 1973
Decay of Temporary Threshold Shift in Noise
Journal of Speech, Language, and Hearing Research, June 1973, Vol. 16, 267-270. doi:10.1044/jshr.1602.267
History: Received October 17, 1972 , Accepted March 25, 1973
 
Journal of Speech, Language, and Hearing Research, June 1973, Vol. 16, 267-270. doi:10.1044/jshr.1602.267
History: Received October 17, 1972; Accepted March 25, 1973

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.

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