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Frequency selectivity and consonant intelligibility in sensorineural hearing loss.

J Preminger, T L Wiley

    Journal of Speech and Hearing Research
    |June 1, 1985
    PubMed
    Summary

    This study explored how frequency selectivity relates to consonant intelligibility in individuals with sensorineural hearing loss. Specific psychophysical tuning curve (PTC) features predicted speech performance in most participants, aiding in index development.

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    Area of Science:

    • Audiology
    • Speech Science
    • Hearing Research

    Background:

    • Sensorineural hearing loss (SNHL) often impairs speech understanding, particularly consonant intelligibility.
    • Frequency selectivity, a measure of hearing system's ability to distinguish frequencies, is crucial for speech perception.
    • Predictive indices linking frequency selectivity to intelligibility could improve hearing aid fitting and rehabilitation.

    Purpose of the Study:

    • To investigate the relationship between frequency selectivity and consonant intelligibility in subjects with SNHL.
    • To identify psychophysical tuning curve (PTC) characteristics that predict speech intelligibility.
    • To develop frequency-specific predictive indices for hearing loss impact.

    Main Methods:

    • Recruited three matched pairs of subjects with similar audiometric configurations (high-frequency, flat, or low-frequency SNHL) but differing intelligibility scores.

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  • Measured psychophysical tuning curves (PTCs) using high- and low-frequency probes.
  • Assessed speech-intelligibility performance using high- and low-frequency consonant-vowel syllables.

    • Main Results:

    • Frequency-specific relationships between PTC characteristics and consonant intelligibility were observed in subjects with high-frequency and flat SNHL.
    • These findings suggest PTCs can predict speech performance in certain SNHL types.
    • Results for subjects with low-frequency SNHL were inconclusive, requiring further investigation.

    Conclusions:

    • Frequency selectivity, as measured by PTCs, is a significant predictor of consonant intelligibility in individuals with high-frequency and flat SNHL.
    • PTC-derived indices show promise for predicting speech perception difficulties in SNHL.
    • Further research is needed to clarify the role of frequency selectivity in low-frequency SNHL and its impact on intelligibility.