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Related Experiment Videos

Ipsilateral acoustic reflexes in infants.

P M McMillan, C D Marchant, P A Shurin

    The Annals of Otology, Rhinology, and Laryngology
    |March 1, 1985
    PubMed
    Summary
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    Acoustic reflex testing in infants showed high detection rates for most frequencies, with median thresholds around 80-85 dB HL. These measures can help identify infant hearing loss and middle ear conditions.

    Area of Science:

    • Audiology
    • Pediatric audiology
    • Otoacoustic emissions

    Background:

    • The acoustic reflex is a crucial indicator of middle ear function and auditory pathway integrity.
    • Assessing acoustic reflexes in infants is vital for early detection of hearing impairments and middle ear pathologies.

    Purpose of the Study:

    • To investigate ipsilateral acoustic reflex thresholds in infants aged 2 weeks to 12 months.
    • To evaluate the efficacy of different probe tones and pure tone activators in infant reflex detection.

    Main Methods:

    • Studied otoscopically normal infant ears (2 weeks to 12 months old).
    • Utilized 220 Hz and 660 Hz probe tones with pure tone activators (500, 1000, 2000, 4000 Hz).
    • Ensured reflex recordings were artifact-free and measured quantitatively.

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    Main Results:

    • Reflexes detected in 85-95% of infant ears for 500-2000 Hz activators, but only 76% at 4000 Hz.
    • Median thresholds ranged from 80-85 dB hearing level (HL) across all activators and probe tones.
    • No significant differences in reflex presence were found between the two probe tones.
    • Lower thresholds were observed with a 220 Hz probe tone compared to 660 Hz for a 500 Hz activator.

    Conclusions:

    • Ipsilateral acoustic reflex measurements are feasible and informative in infants.
    • These measures show potential for early identification of hearing loss and middle ear disease in this population.
    • Age within the first year did not significantly impact reflex presence or threshold.