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Normal hearing threshold levels in the low-frequency range determined by an insert earphone.

S D Arlinger1

  • 1Department of Audiology, University Hospital, Linköping, Sweden.

The Journal of the Acoustical Society of America
|November 1, 1991
PubMed
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This study determined low-frequency hearing thresholds in normal-hearing adults using insert earphones. Results show acceptable validity and reliability for frequencies 40 Hz and above, aiding audiological assessments.

Area of Science:

  • Audiology
  • Hearing Science
  • Psychoacoustics

Background:

  • Accurate measurement of hearing thresholds is crucial for diagnosing hearing loss.
  • Limited data exists for reliable low-frequency (below 500 Hz) hearing threshold determination using insert earphones.
  • Standardized audiological testing protocols require validated methods for all frequency ranges.

Purpose of the Study:

  • To determine hearing threshold levels in the low-frequency range (20-500 Hz) using insert earphones.
  • To assess the test-retest reliability of these measurements.
  • To compare obtained thresholds with existing international standards.

Main Methods:

  • Monaural stimulus presentation using Etymotic Research ER-3A insert earphones.
  • Testing 30 young, normal-hearing subjects.

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  • Retest measurements on half the cohort to evaluate reliability.

    • Main Results:

    • Mean hearing threshold levels closely align with ISO 226 Minimum Audible Field data.
    • A slight deviation was observed below 40 Hz.
    • Test-retest reliability showed a mean difference of 1.15 dB and a standard deviation of 3.9 dB.

    Conclusions:

    • Insert earphones provide valid and reliable measurements for low-frequency hearing thresholds (≥40 Hz).
    • This method supports accurate audiological assessments in the low-frequency range.
    • Further investigation may be needed for frequencies below 40 Hz.