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Related Experiment Videos

Insertion gain measured with three probe tube systems.

L E Humes1, N M Hipskind, M G Block

  • 1Department of Speech of Hearing Sciences, Indiana University, Bloomington.

Ear and Hearing
|June 1, 1988
PubMed
Summary

This study found that probe tube microphone measurements for hearing aid insertion gain are reliable and accurate. These measures closely align with behavioral functional gain assessments in hearing-impaired individuals.

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Area of Science:

  • Audiology
  • Hearing Science
  • Biomedical Engineering

Background:

  • Accurate measurement of hearing aid performance is crucial for effective amplification.
  • Probe tube microphones offer a method for in-situ gain assessment.
  • Understanding the reliability and validity of probe tube measures is essential for clinical practice.

Purpose of the Study:

  • To evaluate the test-retest reliability of insertion gain measurements using three commercial probe tube microphone systems.
  • To compare insertion gain measurements obtained with probe tube microphones to behaviorally measured functional gain.
  • To determine the accuracy and consistency of probe tube measures in assessing hearing aid performance.

Main Methods:

  • Experiment I: Measured insertion gain of a mild gain hearing aid on 12 subjects using three probe tube systems, with measurements repeated by two examiners.

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  • Experiment II: Compared probe tube insertion gain measures to behavioral functional gain in 7 hearing-impaired subjects across various frequencies.
  • Statistical analysis included calculating test-retest differences and correlations between measurement methods.

    • Main Results:

    • Test-retest differences for insertion gain were consistently below 4 dB across systems.
    • 95% critical differences ranged from approximately 3 to 8 dB, depending on the probe tube system.
    • No significant differences were found between the three probe tube measures or between probe tube measures and functional gain.
    • Functional gain was significantly correlated with probe tube insertion gain from 500 to 4000 Hz.

    Conclusions:

    • Probe tube microphone systems demonstrate good test-retest reliability for measuring hearing aid insertion gain.
    • Insertion gain measured with probe tube microphones is a valid indicator of functional gain in hearing-impaired individuals.
    • These findings support the use of probe tube microphone technology for accurate hearing aid fitting and verification.