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Interaural attenuation using insert earphones: electrocochleographic approach

O A Sobhy1, H J Gould

  • 1Memphis Speech and Hearing Center, Memphis State University, Tennessee 38105.

Journal of the American Academy of Audiology
|March 1, 1993
PubMed
Summary

Interaural attenuation was measured for click stimuli using insert earphones. Crossover occurred in normal listeners, confirming the need for masking in evoked potential testing even with insert earphones.

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Area of Science:

  • Audiology
  • Neurophysiology

Background:

  • Insert earphones are commonly used in audiological testing.
  • Understanding interaural attenuation is crucial for accurate evoked potential measurements.

Purpose of the Study:

  • To measure interaural attenuation for click stimuli presented via insert earphones.
  • To determine if masking is necessary in evoked potential testing when using insert earphones.

Main Methods:

  • Electrocochleography was used to determine thresholds.
  • Click stimuli were presented both ipsilaterally and contralaterally to the recording ear.
  • Interaural attenuation was calculated as the difference between ipsilateral and contralateral thresholds.

Main Results:

  • Significant interaural attenuation was observed in normal-hearing listeners.

Related Experiment Videos

  • Crossover of click stimuli to the non-test ear occurred.
  • Results align with previous investigations using different methodologies.

    • Conclusions:

    • Masking the non-test ear may be necessary in clinical evoked potential testing, even when using insert earphones.
    • The findings support the need for careful consideration of masking strategies.
    • Several approaches for determining when to mask are proposed.