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Related Experiment Videos

A multifrequency method for determining cochlear efferent activity.

Anne E Luebke1, Paul K Foster, Barden B Stagner

  • 1Department of Otolaryngology, University of Miami School of Medicine, FL 33101, USA. aluebke@chroma.med.miami.edu

Journal of the Association for Research in Otolaryngology : JARO
|June 27, 2002
PubMed
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A new test using distortion-product otoacoustic emissions (DPOAEs) assesses the cochlear efferent system. In awake rabbits, the acoustic reflex confounds results, complicating interpretation of efferent system strength.

Area of Science:

  • Auditory Neuroscience
  • Otoacoustic Emissions
  • Neurophysiology

Background:

  • The cochlear efferent system modulates auditory sensitivity.
  • Assessing its functional strength is crucial for understanding auditory processing.
  • Distortion-product otoacoustic emissions (DPOAEs) are sensitive to efferent activity.

Purpose of the Study:

  • To develop and validate a multifrequency test to measure the functional strength of the cochlear efferent system.
  • To differentiate efferent system activity from concurrent muscle activation, such as the acoustic reflex.
  • To evaluate the efferent system's fast adaptive component using the DP-gram frequency function.

Main Methods:

  • A multifrequency test utilizing DPOAEs was administered to lightly anesthetized guinea pigs and alert rabbits.

Related Experiment Videos

  • The DP-gram frequency function was employed to assess efferent effects on DPOAE levels across a 2-octave range.
  • Muscle activation, specifically the acoustic reflex, was monitored by measuring the constancy of the eliciting f1 primary tone level.

    • Main Results:

    • In sedated guinea pigs, the acoustic reflex did not significantly contribute to the measured efferent strength.
    • In alert rabbits, the acoustic reflex was found to contribute to the measured efferent strength.
    • The acoustic reflex contaminated the interpretation of the efferent system's functional strength in awake rabbits.

    Conclusions:

    • The developed DPOAE-based test can assess cochlear efferent system strength.
    • The acoustic reflex can confound the measurement of efferent strength in alert animals.
    • Careful consideration of confounding factors like the acoustic reflex is necessary for accurate interpretation of efferent system function.