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Related Experiment Videos

Modulation detection by patients with eighth-nerve tumors.

C Formby

    Journal of Speech and Hearing Research
    |September 1, 1986
    PubMed
    Summary

    Patients with eighth-nerve tumors show impaired detection of amplitude-modulated noise, requiring more modulation across frequencies. This suggests a doubled auditory time constant, likely due to high-frequency hearing loss.

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    Area of Science:

    • Auditory Neuroscience
    • Audiology
    • Neuro-oncology

    Background:

    • Eighth-nerve tumors can affect auditory processing.
    • Understanding auditory deficits associated with these tumors is crucial.

    Purpose of the Study:

    • To investigate auditory processing in patients with eighth-nerve tumors.
    • To determine if hearing loss characteristics explain impaired modulation detection.

    Main Methods:

    • Measured detection thresholds for sinusoidally amplitude-modulated broad-band noise.
    • Used a method-of-adjustment procedure across various modulation frequencies.
    • Compared normally hearing listeners with patients suffering eighth-nerve tumors.

    Main Results:

    • Patients with eighth-nerve tumors required significantly more modulation to detect the signal compared to controls.
    • The average modulation-threshold function (MTF) cutoff frequency was halved in affected ears.
    • This suggests a doubling of the auditory time constant in affected ears.

    Conclusions:

    • High-frequency audiometric hearing loss is the most likely explanation for increased modulation thresholds in eighth-nerve tumor patients.
    • Auditory time constant appears prolonged in affected ears.
    • Findings support the link between specific hearing loss patterns and impaired temporal processing.

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