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Frequency selectivity and speech discrimination in sensorineural hearing loss.

P Bonding

    Scandinavian Audiology
    |January 1, 1979
    PubMed
    Summary

    The psychoacoustic tuning curve (PTC) better predicts speech discrimination than critical band (CB) in patients with cochlear disorders. Impaired frequency selectivity, indicated by PTC, significantly impacts speech understanding.

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    Area of Science:

    • Audiology
    • Neuroscience
    • Speech-Language Pathology

    Background:

    • Auditory frequency selectivity is crucial for speech discrimination.
    • Existing measures like critical band (CB) and psychoacoustic tuning curve (PTC) assess this selectivity.
    • Their clinical relevance in cochlear disorders needs further clarification.

    Purpose of the Study:

    • To compare the validity of CB and PTC in assessing auditory frequency selectivity.
    • To correlate these measures with speech discrimination abilities in patients with cochlear disorders.
    • To investigate the role of impaired frequency selectivity in speech understanding deficits.

    Main Methods:

    • Measured CB (loudness summation) and PTC (at 1 kHz) in patients with cochlear disorders.
    • Assessed speech discrimination in noise and filtered conditions.
    • Correlated CB and PTC measures with hearing loss degree and speech discrimination scores.

    Main Results:

    • CB showed no correlation with hearing loss or speech discrimination.
    • PTC deteriorated with increasing hearing loss, similar to electrophysiological tuning curves (FTC).
    • A significant correlation was found between speech discrimination scores and PTC, indicating impaired cochlear tuning.

    Conclusions:

    • PTC is a more valid measure of auditory frequency selectivity than CB in cochlear disorder patients.
    • Impaired frequency selectivity, as measured by PTC, is a likely cause of reduced speech discrimination.
    • These findings support the hypothesis linking poor frequency selectivity to speech understanding difficulties.

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