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Related Experiment Videos

Supporting evidence for reverse cochlear traveling waves.

W Dong1, E S Olson

  • 1Department of Otolaryngology, Head and Neck Surgery, Columbia University, P & S 11-452, 630 West 168th Street, New York, New York 10032, USA. wd2015@columbia.edu

The Journal of the Acoustical Society of America
|January 8, 2008
PubMed
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Distortion product oto-acoustic emissions, used to study hearing loss, are generated by cochlear mechanics. New research measuring intracochlear distortion products supports the existence of reverse cochlear traveling waves, challenging prior findings.

Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Otoacoustic Emissions

Background:

  • Cochlear nonlinear mechanics produce distortion products (DPs) at specific frequencies.
  • DPs are measurable as oto-acoustic emissions, aiding in noninvasive cochlear mechanics assessment and hearing loss diagnosis.
  • Existing theories propose both forward and reverse cochlear traveling waves contribute to DP emissions.

Purpose of the Study:

  • To investigate the mechanism of distortion product (DP) generation and emission.
  • To explore the role of reverse cochlear traveling waves in DP emissions.
  • To reconcile conflicting experimental findings regarding cochlear traveling waves.

Main Methods:

  • Simultaneous measurement of intracochlear DPs and ear canal emissions across a wide frequency range.

Related Experiment Videos

  • Measurements were conducted near and remote from the basilar membrane.
  • Analysis focused on spatial variation, frequency-dependent behavior, and temporal delays of DPs.

    • Main Results:

    • Observed spatial variations in DPs inconsistent with a simple compression pressure model.
    • Confirmed forward-traveling wave characteristics for intracochlear DPs in certain frequency regions.
    • Demonstrated a delay in DP emission relative to intracochlear DPs, supporting reverse-traveling wave theory.

    Conclusions:

    • The findings provide evidence supporting the existence of reverse cochlear traveling waves.
    • The results challenge the conclusion that DP emissions solely travel as compression pressure through cochlear fluid.
    • This study refines our understanding of cochlear mechanics and the generation of oto-acoustic emissions.