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Temporal modulation transfer functions in normal-hearing and hearing-impaired listeners.

S P Bacon, N F Viemeister

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1985
    PubMed
    Summary

    Hearing-impaired listeners show reduced sensitivity to amplitude modulation, with temporal modulation transfer functions (TMTFs) being level-dependent. This suggests impaired temporal processing in hearing loss may stem from a narrower internal bandwidth.

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Audiology

    Background:

    • Sensorineural hearing impairment often affects temporal processing, impacting speech comprehension.
    • Temporal modulation transfer functions (TMTFs) are crucial for assessing auditory temporal resolution.

    Purpose of the Study:

    • To investigate amplitude modulation detection in normal-hearing and hearing-impaired listeners.
    • To characterize the level-dependency of TMTFs in sensorineural hearing loss.
    • To explore the role of internal bandwidth in impaired temporal processing.

    Main Methods:

    • Obtained modulation thresholds for sinusoidally amplitude-modulated broadband noise in normal-hearing and hearing-impaired listeners.
    • Measured TMTFs as a function of modulation frequency and sound level.

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  • Utilized band-limited noise (low-pass filtered) in normal-hearing listeners for comparison.
  • Measured increment thresholds for continuous broadband and low-pass noise.

    • Main Results:

    • Hearing-impaired listeners exhibited lower sensitivity to amplitude modulation compared to normal-hearing listeners.
    • TMTFs in impaired listeners were level-dependent, with decreased sensitivity at lower sound levels, especially for modulation frequencies >100 Hz.
    • TMTFs in normal-hearing listeners with low-pass filtered noise resembled those of impaired listeners with broadband noise.
    • A consistent power-law relationship between modulation and increment thresholds was observed across both listener groups.

    Conclusions:

    • Sensorineural hearing impairment is associated with reduced temporal modulation sensitivity.
    • The level-dependency of TMTFs in hearing impairment suggests altered peripheral or central processing.
    • A narrower effective internal bandwidth may underlie the temporal processing deficits observed in hearing-impaired listeners.