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Masking level differences in central nervous system diseases

A Quaranta, G Cervellera

    Archives of Otolaryngology (Chicago, Ill. : 1960)
    |August 1, 1977
    PubMed
    Summary
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    Pathological tonal masking level difference (MLD) performance in normal-hearing individuals with central nervous system (CNS) diseases indicates central auditory pathway lesions. These MLD abnormalities correlate with specific bulbo-pontine lesions or central hearing asymmetry.

    Area of Science:

    • Neuroscience
    • Audiology
    • Otolaryngology

    Background:

    • The tonal masking level difference (MLD) is a measure of binaural hearing, sensitive to central auditory processing.
    • Sensitized speech tests, developed by Bocca and Calearo, assess central auditory function.
    • Central nervous system (CNS) diseases can affect auditory pathways, leading to hearing impairments.

    Purpose of the Study:

    • To investigate the relationship between tonal MLD performance and sensitized speech test results in normal-hearing individuals with CNS diseases.
    • To identify specific CNS lesions or conditions associated with abnormal MLD values.

    Main Methods:

    • Subjects with normal hearing and diagnosed CNS diseases were recruited.
    • Tonal MLD thresholds were measured.

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  • Sensitized speech tests (Bocca and Calearo) were administered.

    • Main Results:

    • All subjects with pathological sensitized speech tests exhibited pathological MLD values.
    • Pathological MLDs were primarily linked to bulbo-pontine lesions and central hearing functional asymmetry.
    • Abnormal tonal MLDs in this cohort suggest lesions within the central auditory pathways.

    Conclusions:

    • Pathological tonal MLDs in normal-hearing individuals with CNS diseases are indicative of central auditory pathway damage.
    • MLD testing can serve as a valuable tool for detecting and localizing central auditory processing deficits in neurological conditions.