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Interaural attenuation using etymotic ER-3A insert earphones in auditory brain stem response testing.

L E Van Campen1, C A Sammeth, B F Peek

  • 1Division of Hearing and Speech Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee.

Ear and Hearing
|February 1, 1990
PubMed
Summary

Etymotic ER-3A insert earphones offer greater interaural attenuation (IA) for pure-tone audiometry. However, for auditory brainstem response (ABR) click stimuli, they provide minimal IA advantage over supraaural earphones.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Accurate audiological testing requires precise control of sound delivery to each ear.
  • Insert earphones are often presumed to offer superior interaural attenuation (IA) compared to supraaural earphones.
  • Understanding IA differences is crucial for reliable auditory brainstem response (ABR) and behavioral audiometry.

Purpose of the Study:

  • To compare the interaural attenuation (IA) provided by Etymotic ER-3A insert earphones versus TDH-39P/TDH-49P supraaural earphones.
  • To evaluate IA for both behavioral pure-tone audiometry and auditory brainstem response (ABR) click stimuli.
  • To determine the necessity of contralateral masking for ABR testing with different earphone types.

Main Methods:

  • Behavioral and ABR measurements of click interaural attenuation (IA).

Related Experiment Videos

  • Pure-tone audiometry to assess stimulus crossover and IA.
  • Testing conducted on two adults with unilateral hearing loss using ER-3A, TDH-39P, and TDH-49P earphones.

    • Main Results:

    • ER-3A earphones demonstrated significantly greater IA than supraaural earphones for pure-tone stimuli, especially at low frequencies.
    • For click stimuli, behavioral and ABR measurements showed only a small IA improvement with ER-3A earphones compared to supraaural types.
    • Stimulus crossover varied between earphone types, aligning with previous research.

    Conclusions:

    • Etymotic ER-3A earphones provide a significant IA advantage for behavioral pure-tone audiometry.
    • The IA benefit of ER-3A earphones for ABR click stimuli is modest.
    • Contralateral masking remains necessary for click-based ABR testing, even with ER-3A insert earphones.