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Behavioral thresholds for tones during infancy.

K M Berg, M C Smith

    Journal of Experimental Child Psychology
    |June 1, 1983
    PubMed
    Summary
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    Infants aged 6 to 18 months show developing auditory sensitivity. While younger infants struggle with high frequencies, older infants demonstrate adult-like hearing across tested frequencies.

    Area of Science:

    • Audiology
    • Developmental Psychology
    • Acoustics

    Background:

    • Auditory development in infants is crucial for speech perception and language acquisition.
    • Understanding auditory sensitivity across different frequencies in early childhood is essential for identifying potential hearing impairments.

    Purpose of the Study:

    • To assess auditory sensitivity to pure-tone stimuli at 500, 2000, and 8000 Hz in infants aged 6 to 18 months.
    • To compare auditory thresholds between different age groups and testing conditions (headphones vs. sound field).

    Main Methods:

    • Utilized an adaptive up-down tracking procedure combined with a visually reinforced head turn response.
    • Tested infants using headphone presentation (6- and 10-month-olds) and sound field presentation (10-, 14-, and 18-month-olds).

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    Main Results:

    • Infant auditory threshold estimates were comparable to adult values across all tested frequencies and age groups (within 15 dB).
    • Six-month-olds exhibited significantly reduced sensitivity to 8000-Hz tones compared to lower frequencies.
    • Older infants (10-18 months) showed similar auditory sensitivity across all three tested frequencies.

    Conclusions:

    • Infant auditory sensitivity develops significantly between 6 and 18 months of age.
    • High-frequency hearing (8000 Hz) matures later than lower frequencies in early infancy.
    • The study confirms reliable methods for assessing infant auditory thresholds in both headphone and sound field conditions.