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Related Experiment Videos

Nonlinear interactions that could explain distortion product interference response areas.

P F Fahey1, B B Stagner, B L Lonsbury-Martin

  • 1Department of Physics/EE, University of Scranton, Pennsylvania 18510, USA. faheypl@uofs.edu

The Journal of the Acoustical Society of America
|October 29, 2000
PubMed
Summary
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A third tone can suppress or enhance auditory distortion products. Two mechanisms, harmonic and catalyst, explain this effect, with the catalyst mechanism dominating high frequencies and the harmonic mechanism low frequencies in the cochlea.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Nonlinear Acoustics

Background:

  • Third- and fifth-order distortion products are generated in the auditory system.
  • A third tone can significantly suppress or enhance these distortion products.
  • Interference response areas map suppression/enhancement based on third-tone frequency and level.

Purpose of the Study:

  • To investigate the mechanisms behind third-tone suppression and enhancement of distortion products.
  • To differentiate between harmonic and catalyst mechanisms based on cochlear frequency regions.

Main Methods:

  • Experimental measurement of distortion product suppression/enhancement.
  • Development of theoretical models for harmonic and catalyst mechanisms.
  • Analysis of basilar membrane frequency response predictions.

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Main Results:

  • Two mechanisms, harmonic and catalyst, were identified.
  • The catalyst mechanism is predicted to dominate in high-frequency cochlear regions.
  • The harmonic mechanism is predicted to be significant in low-frequency cochlear regions.
  • Both mechanisms depend on even- and odd-order distortion, which were experimentally observed.

Conclusions:

  • The spatial distribution of distortion product suppression/enhancement is explained by frequency-dependent dominance of the catalyst and harmonic mechanisms.
  • Cochlear saturation is a prerequisite for these effects at high sound pressure levels.