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Related Experiment Videos

Predicting pure-tone thresholds with dichotic multiple frequency auditory steady state responses.

Dunay Schmulian1, DeWet Swanepoel, René Hugo

  • 1University of Pretoria, South Africa. dunay2003@yahoo.com

Journal of the American Academy of Audiology
|February 18, 2005
PubMed
Summary

Dichotic multiple frequency auditory steady state (Mf ASSR) accurately predicts hearing thresholds across various frequencies. While effective, some low-frequency estimates may show discrepancies depending on hearing loss configuration.

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Area of Science:

  • Audiology
  • Neuroscience
  • Hearing Science

Background:

  • Accurate prediction of pure-tone thresholds is crucial for diagnosing and managing hearing loss.
  • Auditory Evoked Potential (AEP) protocols, including Auditory Brainstem Response (ABR), are commonly used but can have limitations.
  • The efficacy of dichotic multiple frequency auditory steady state (Mf ASSR) in threshold prediction requires further investigation.

Purpose of the Study:

  • To compare the accuracy of Mf ASSR in predicting pure-tone thresholds with a standard ABR protocol.
  • To evaluate Mf ASSR performance across different frequencies (0.5, 1, 2, and 4.0 kHz) and hearing loss characteristics.

Main Methods:

  • Twenty-five hearing-impaired subjects participated, covering a spectrum of hearing loss degrees and configurations.

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  • Mf ASSR thresholds were recorded and compared to pure-tone thresholds.
  • ABR protocols (click and tone burst at 0.5 kHz) were used as a comparative measure.

    • Main Results:

    • Mean Mf ASSR thresholds showed a mean difference of 14-18 dB from pure-tone thresholds across tested frequencies.
    • The tone-burst ABR at 0.5 kHz had a mean difference of 24 dB, and click-evoked ABR (2-4 kHz) had a difference of 9 dB.
    • Mf ASSR recording time averaged 28 minutes, comparable to the ABR protocol's 24 minutes; degree of hearing loss significantly impacted Mf ASSR accuracy.

    Conclusions:

    • Mf ASSR demonstrates relative accuracy in predicting pure-tone thresholds, outperforming ABR in certain comparisons.
    • Hearing loss degree significantly influences Mf ASSR results, while configuration has a lesser effect.
    • Discrepancies in low-frequency estimates may occur with Mf ASSR, necessitating careful interpretation for specific hearing loss configurations.