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Modeling otoacoustic emission and hearing threshold fine structures

C L Talmadge1, A Tubis, G R Long

  • 1Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.

The Journal of the Acoustical Society of America
|September 24, 1998
PubMed
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New cochlear models explain otoacoustic emissions and hearing thresholds. These models, based on wave reflections, accurately describe frequency variations and relationships in various auditory emissions and hearing data.

Area of Science:

  • Auditory Neuroscience
  • Acoustics
  • Biophysics

Background:

  • Human otoacoustic emissions and hearing thresholds exhibit complex frequency variations.
  • Existing models struggle to fully capture these microstructural variations.
  • Zweig and Shera proposed models based on wave reflections and cochlear activity patterns.

Purpose of the Study:

  • To present a class of cochlear models that explain variations in human otoacoustic emissions and hearing threshold microstructure.
  • To describe the quasiperiodic frequency variations (fine structures) observed in different types of otoacoustic emissions and hearing thresholds.
  • To elucidate the relationships between these fine structures and the distortion product emission filter shape.

Main Methods:

  • Developing cochlear models based on wave reflections from distributed spatial cochlear inhomogeneities.

Related Experiment Videos

  • Incorporating tall and broad cochlear activity patterns as suggested by Zweig and Shera.
  • Utilizing solutions of apical and basal moving cochlear wave equations in the absence of inhomogeneities for analysis.

    • Main Results:

    • The models successfully describe quasiperiodic frequency variations in hearing thresholds, spontaneous, synchronous, click-evoked, and distortion-product otoacoustic emissions.
    • The models accurately predict the relationships between these fine structures.
    • A characteristic frequency spacing of approximately 0.4 bark, determined by the apical reflection function, is identified for most emissions and threshold microstructure.

    Conclusions:

    • The presented cochlear models provide a unified framework for understanding otoacoustic emissions and hearing threshold microstructure.
    • The models highlight the crucial role of wave reflections and cochlear inhomogeneities in generating auditory fine structures.
    • Predictions regarding frequency spacings for different emission types offer testable hypotheses for future research.