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Developmental norms for the acoustic reflex.

S E Gerber, E L Gong, M I Mendel

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1984
    PubMed
    Summary
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    Infant acoustic reflex development shows maturation between 12 and 36 weeks, with age influencing signal levels and intensity needed for elicitation. Noise stimuli and frequency did not demonstrate age-related changes in this auditory reflex study.

    Area of Science:

    • Pediatric audiology
    • Neuroscience
    • Developmental biology

    Background:

    • The acoustic reflex is a crucial indicator of auditory system function.
    • Understanding early auditory development in infants is vital for identifying potential hearing impairments.

    Purpose of the Study:

    • To investigate the maturation of the acoustic reflex in infants aged 12 to 36 weeks.
    • To determine how age affects the elicitation of the acoustic reflex by different sound stimuli.

    Main Methods:

    • Observation of acoustic reflexes in 45 infants aged 12-36 weeks.
    • Varying signal levels, intensity, and frequencies of auditory stimuli.
    • Utilizing noise stimuli to assess age-related changes.

    Main Results:

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    • A significant decrease in the range of signal levels and intensity required to elicit the acoustic reflex with increasing infant age.
    • No age-related changes were observed in response to noise stimuli.
    • Stimulus frequency did not significantly impact response variation.

    Conclusions:

    • The acoustic reflex pathway demonstrates significant maturation between 12 and 36 weeks of postnatal age.
    • Early maturation of the reflex arc by 12 weeks continues through 36 weeks.
    • Auditory stimulus characteristics influence the developmental trajectory of the acoustic reflex.