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Related Experiment Videos

Evoked acoustic emission: clinical application.

C Elberling, J Parbo, N J Johnsen

    Acta Oto-Laryngologica. Supplementum
    |January 1, 1985
    PubMed
    Summary

    This study shows that click-evoked otoacoustic emissions are a reliable method for detecting cochlear echoes in newborns. This technique offers significant diagnostic information, even in very young infants.

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    Area of Science:

    • Auditory Neuroscience
    • Otoacoustic Emissions
    • Neonatal Hearing Screening

    Background:

    • Stimulated acoustic emissions (SAEs) are objective measures of cochlear function.
    • Previous research has utilized tonal stimuli, but their efficacy in capturing comprehensive cochlear activity is debated.

    Purpose of the Study:

    • To investigate the characteristics of SAEs evoked by tonal and click stimuli in normal-hearing adults.
    • To assess the feasibility of using click-evoked emissions for neonatal hearing screening.

    Main Methods:

    • Recording SAEs in response to tonal and click stimuli in adults.
    • Power spectral analysis and deconvolution to characterize the emission-generating system.
    • Recording click-evoked emissions in newborns and performing cross-correlation analysis.

    Main Results:

    • Adult SAEs showed energy in preferential frequency bands, with minor changes across stimulus frequencies.
    • The emission-generating system exhibited linear characteristics, similar to click-evoked responses.
    • Neonatal click-evoked emissions demonstrated amplitudes comparable to adults, with high reproducibility.
    • True emissions were detected in all tested newborn ears with a low rate of false positives.

    Conclusions:

    • Click-evoked otoacoustic emissions provide more significant information than tonal stimuli for assessing cochlear function.
    • Otoacoustic emissions are a viable and reliable tool for objective hearing assessment in normal-hearing newborns.
    • This method allows for early detection of cochlear echoes, crucial for neonatal hearing screening programs.

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