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Intensity discrimination and increment detection at 16 kHz

S P Bacon1, N F Viemeister

  • 1Department of Speech and Hearing Science, Arizona State University, Tempe 85287-1908.

The Journal of the Acoustical Society of America
|May 1, 1994
PubMed
Summary

High-frequency tones that become inaudible still affect auditory perception, behaving as if audible. This suggests long-term adaptation occurs peripherally, differing from short-term adaptation mechanisms.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Very high-frequency tones can become inaudible after several seconds in individuals with normal hearing.
  • Understanding the perceptual consequences of this inaudibility is crucial for auditory models.

Purpose of the Study:

  • To investigate the auditory system's behavior when exposed to inaudible high-frequency tones.
  • To compare intensity difference limens (DLs) for audible and inaudible tones at 16 kHz and 1 kHz.

Main Methods:

  • Intensity difference limens (DLs) were measured at 16 kHz using both gated (audible) and continuous (inaudible) pedestals.
  • Measurements were taken across a range of pedestal sensation levels (0-60 dB).
  • Results were compared to previously obtained data at 1 kHz.

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Main Results:

  • Intensity DLs at 16 kHz were similar for both audible and inaudible pedestals.
  • An inaudible 16-kHz continuous pedestal behaved perceptually as if it were audible.
  • High-frequency tone decay showed minimal correlation with intensity DLs.

Conclusions:

  • Long-term auditory adaptation to high-frequency tones likely occurs peripherally, possibly at the hair cell or auditory nerve.
  • The adaptation mechanism appears to be multiplicative, differing from subtractive short-term adaptation.