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Otoacoustic emissions measured with a physically open recording system

R H Withnell1, D L Kirk, G K Yates

  • 1Department of Physiology, University of Western Australia, Nedlands, Australia.

The Journal of the Acoustical Society of America
|July 22, 1998
PubMed
Summary

A new physically open recording system allows for wider stimulus bandwidth in measuring otoacoustic emissions. This method, tested in guinea pigs, shows comparable otoacoustic emission magnitudes to traditional sealed systems.

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Area of Science:

  • Otoacoustic Emissions
  • Auditory Physiology
  • Bioacoustics

Background:

  • Traditional otoacoustic emissions measurement systems use hermetically sealed probes, limiting stimulus bandwidth.
  • Physically open systems offer potential for broader stimulus bandwidth but may alter acoustical load.
  • Understanding the impact of acoustical load is crucial for validating new measurement techniques.

Purpose of the Study:

  • To evaluate a physically open recording system for measuring otoacoustic emissions in guinea pigs.
  • To compare the magnitude of otoacoustic emissions obtained with open versus sealed recording systems.
  • To assess the feasibility of using open systems for a greater stimulus bandwidth.

Main Methods:

  • Measured transient-evoked otoacoustic emissions (TEOAEs) up to 20 kHz and cubic distortion product otoacoustic emissions (DPOAEs) using a physically open system in guinea pigs.

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  • Compared the amplitude of electrically evoked otoacoustic emissions (EEOAEs) between physically open and hermetically sealed recording setups.
  • Analyzed the effect of acoustical load variations introduced by the different recording systems.

    • Main Results:

    • TEOAEs were successfully measured up to 20 kHz, and DPOAEs were recorded at specified frequencies using the open system.
    • The amplitude of EEOAEs showed no substantial difference between the open and sealed recording configurations.
    • The change in acoustical load did not significantly impact the measured otoacoustic emission magnitudes.

    Conclusions:

    • A physically open recording system is a viable alternative for laboratory measurements of otoacoustic emissions.
    • This system permits a greater stimulus bandwidth compared to traditional sealed probe assemblies.
    • The acoustical load variations between open and sealed systems do not significantly affect otoacoustic emission measurements.