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High-frequency audiometry. Accelerometric findings with electric bone-conduction audiometry.

H Löppönen1, K Laitakari, M Sorri

  • 1Department of Otolaryngology, University of Oulu, Finland.

Scandinavian Audiology
|January 1, 1991
PubMed
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This study confirms a real bone-conduction effect in high-frequency audiometry using the Audimax 500. Adjustments are needed for accurate equal hearing levels across frequencies.

Area of Science:

  • Audiology
  • Bioacoustics
  • Biomedical Engineering

Background:

  • High-frequency audiometry is crucial for detecting early hearing loss.
  • Understanding bone-conduction mechanisms in high-frequency audiometry is essential for accurate hearing assessments.

Purpose of the Study:

  • To investigate skull vibrations and bone-conduction effects of the Audimax 500 high-frequency audiometer.
  • To evaluate maximum output levels, equivalent threshold force level (ETFL) decreases, and distortions across frequencies (0.5-20 kHz).
  • To assess the impact of different electrode positions on audiometer performance.

Main Methods:

  • Utilized a sensitive accelerometer to measure skull vibrations induced by the Audimax 500 in five subjects.
  • Measured maximum output levels, ETFL decreases, and harmonic distortions.

Related Experiment Videos

  • Examined the influence of various electrode placements, including bilateral mastoid placement.

    • Main Results:

    • Confirmed a genuine bone-conduction effect across the high-frequency range (0.5-20 kHz) with the Audimax 500.
    • Mean maximum output levels ranged from 60-70 dB ETFL.
    • Identified a need for frequency-dependent additive corrections to achieve equal hearing levels due to output level variations; distortions were generally not audible.

    Conclusions:

    • The Audimax 500 demonstrates a reliable bone-conduction effect in high-frequency audiometry.
    • Frequency-dependent corrections are necessary for precise hearing level calibration.
    • Electrode placement influences distortion levels, though typically not to an audible degree.