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Related Experiment Videos

Loudness adaptation at high frequencies

A Miśkiewicz1, B Scharf, R Hellman

  • 1Auditory Perception Laboratory, Northeastern University, Boston, Massachusetts 02115.

The Journal of the Acoustical Society of America
|September 1, 1993
PubMed
Summary
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Loudness adaptation increases significantly with frequency and sensation level, especially at high frequencies like 16 kHz. Many listeners found high-frequency tones inaudible after prolonged exposure.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Audiology

Background:

  • Loudness adaptation is a decrease in perceived loudness over time.
  • Previous studies indicated loudness adaptation increases with frequency near auditory threshold.
  • High-frequency hearing is crucial for speech intelligibility and sound localization.

Purpose of the Study:

  • To investigate loudness adaptation for pure tones at high frequencies (4-16 kHz).
  • To examine the influence of sensation level on high-frequency loudness adaptation.
  • To explore the relationship between hearing thresholds and loudness adaptation at high frequencies.

Main Methods:

  • Three experiments involving 87 young listeners.
  • Method of successive magnitude estimation to judge loudness over 6 minutes.

Related Experiment Videos

  • Adaptive two-interval forced-choice (2IFC) procedure to measure hearing thresholds.

    • Main Results:

    • Loudness adaptation increased markedly with frequency and sensation level.
    • At 40 dB sensation level, loudness declined by 18% at 4 kHz and 94% at 16 kHz over 6 minutes.
    • Two-thirds of listeners found the 16 kHz tone inaudible after 6 minutes, compared to none for the 4 kHz tone.
    • Listeners with lower initial thresholds at 16 kHz showed less adaptation at 14 and 16 kHz.

    Conclusions:

    • High-frequency loudness adaptation is substantial at higher sensation levels.
    • Restricted spread of excitation at high frequencies may underlie this pronounced adaptation.
    • Individual differences in hearing thresholds influence the degree of high-frequency loudness adaptation.