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Related Experiment Videos

Ipsilateral and contralateral acoustic reflexes in neonates.

P M McMillan, M J Bennett, C D Marchant

    Ear and Hearing
    |November 1, 1985
    PubMed
    Summary

    A 660 Hz probe tone significantly improved the detection of acoustic reflexes in neonates compared to a 220 Hz tone. Neonatal thresholds were similar to adults, but intrameatal sound pressure levels were higher than expected.

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    Area of Science:

    • Audiology
    • Neonatal Hearing Screening

    Background:

    • Acoustic reflexes are crucial for assessing auditory pathway function.
    • Understanding neonatal acoustic reflexes aids in early detection of hearing impairments.

    Purpose of the Study:

    • To evaluate the efficacy of different probe tones (220 Hz vs. 660 Hz) for detecting acoustic reflexes in neonates.
    • To compare neonatal and adult acoustic reflex thresholds.
    • To assess intrameatal sound pressure levels in neonates.

    Main Methods:

    • Ipsilateral and contralateral acoustic reflexes were measured in neonates.
    • 220 Hz and 660 Hz probe tones were used with various activator frequencies (500, 1000, 2000, 4000 Hz).
    • Activator sound pressure level and intrameatal sound pressure levels were recorded.

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    Main Results:

    • A 660 Hz probe tone detected reflexes three times more frequently than a 220 Hz probe tone.
    • Maximum detection rates (76%) were achieved with 1000/2000 Hz activators and the 660 Hz probe tone.
    • Neonatal ipsilateral thresholds were comparable to adult thresholds at 500, 1000, and 4000 Hz.
    • Neonatal intrameatal sound pressure levels for ipsilateral activators were significantly higher than manufacturer specifications.

    Conclusions:

    • The 660 Hz probe tone is superior for neonatal acoustic reflex testing.
    • Neonatal hearing appears comparable to adult hearing at specific frequencies.
    • Calibration of sound pressure levels in neonatal testing may require adjustment.