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Related Experiment Videos

Temporary threshold and loudness shifts: frequency patterns and correlations

M C Botte1, S Charron, H Bouayad

  • 1Laboratory of Experimental Psychology (CNRS U.R.A. 316), Paris, France.

The Journal of the Acoustical Society of America
|March 1, 1993
PubMed
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Temporary loudness shift (TLS) patterns change with sound exposure level, revealing a two-peak frequency response at higher levels. This suggests distinct mechanisms for temporary threshold shift (TTS) and TLS.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Audiology

Background:

  • Temporary Loudness Shift (TLS) and Temporary Threshold Shift (TTS) are auditory phenomena studied to understand hearing mechanisms.
  • The relationship between sound exposure characteristics (level, frequency, intermittency) and resulting auditory shifts requires further investigation.
  • Understanding these shifts can provide insights into the mechanical behavior of the basilar membrane.

Purpose of the Study:

  • To investigate the frequency pattern of Temporary Loudness Shift (TLS) in relation to the level and frequency of fatiguing sounds.
  • To explore the psychoacoustical evidence for the dual mode of basilar membrane displacement.
  • To examine the correlation between short-term TLS and long-term TTS.

Main Methods:

Related Experiment Videos

  • Two experiments were conducted using intermittent fatiguing tones at various frequencies and sound pressure levels (SPL).
  • TLS was measured using a continuous test tone presented simultaneously with the fatiguing tone.
  • Temporary Threshold Shift (TTS) was measured after prolonged exposure, and correlations between TLS and TTS were calculated.

    • Main Results:

    • At lower exposure levels, TLS patterns showed a single peak centered on the exposure frequency.
    • At higher exposure levels, a two-peak TLS pattern emerged, with the second peak at higher test frequencies.
    • A significant correlation (up to 0.9) was found between short-term TLS and long-term TTS, particularly at specific frequencies.

    Conclusions:

    • The observed two-peak TLS pattern provides psychoacoustical evidence supporting the double (passive and active) mode of basilar membrane displacement.
    • While correlated, differences in TLS and TTS patterns suggest they arise from distinct underlying mechanisms.
    • TLS measurements after short exposures can be predictive of TTS, offering a potential tool for auditory assessment.