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[Evoked acoustic oto-emissions in cochlear deafness].

R Bartoli1, R Galizia, I Salonna

  • 1Centro di Audiologia e Otologia, Università di Bari.

Bollettino Della Societa Italiana Di Biologia Sperimentale
|March 1, 1992
PubMed
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Evoked Otoacoustic Emissions (EOAEs) were recorded in subjects with hearing loss. Results suggest EOAEs may arise from both passive and active cochlear mechanisms, influenced by hearing loss severity.

Area of Science:

  • Otoacoustic Emissions
  • Auditory Neuroscience
  • Hearing Loss Pathophysiology

Background:

  • Evoked Otoacoustic Emissions (EOAEs) are sounds generated by the cochlea.
  • Understanding the mechanisms of EOAE generation is crucial for diagnosing hearing disorders.
  • Previous research suggests both active and passive mechanisms contribute to EOAEs.

Purpose of the Study:

  • To investigate the genesis of EOAEs in different hearing loss conditions.
  • To correlate EOAE properties with the degree of hearing loss.
  • To explore the role of passive and active cochlear mechanisms in EOAE production.

Main Methods:

  • Recorded EOAEs in subjects with unilateral sudden deafness, Menière disease, and progressive sensorineural hearing loss.
  • Utilized tone-burst and click stimuli for EOAE detection.

Related Experiment Videos

  • Analyzed EOAE properties including detection and saturation thresholds, dynamic range, and duration.

    • Main Results:

    • EOAEs were detected in a high percentage of subjects with hearing loss using tone-burst stimuli.
    • Click-evoked EOAE detection rates were lower across all hearing loss groups.
    • EOAE properties significantly correlated with the degree of hearing loss.

    Conclusions:

    • Findings support the hypothesis that EOAEs are generated by both passive intracochlear mechanisms and active outer hair cell activity.
    • The contribution of each mechanism appears to vary with the type and severity of hearing loss.
    • EOAE characteristics provide insights into cochlear function and dysfunction.