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Related Experiment Videos

Masking level differences encountered in clinical populations.

W O Olsen, D Noffsinger, R Carhart

    Audiology : Official Organ of the International Society of Audiology
    |July 1, 1976
    PubMed
    Summary
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    Masking Level Differences (MLDs) show promise for detecting retrocochlear lesions, particularly in patients with normal hearing sensitivity but subcortical central lesions. However, MLD reliability decreases with hearing loss or interaural differences.

    Area of Science:

    • Audiology
    • Neuroscience
    • Clinical Otolaryngology

    Background:

    • Masking Level Differences (MLDs) assess binaural hearing, crucial for sound localization and speech understanding in noise.
    • Clinical application of MLDs is explored to evaluate their diagnostic utility for auditory pathway disorders.

    Purpose of the Study:

    • To investigate the clinical feasibility and diagnostic value of MLD measurements at 500 Hz and for spondees.
    • To determine if MLDs can differentiate cochlear from retrocochlear auditory pathologies.

    Main Methods:

    • Utilized Békésy audiometry and speech reception threshold procedures to measure MLDs in 290 subjects (50 normal hearing, 240 with various diseases).
    • Assessed MLDs at 500 Hz and with spondee words.

    Main Results:

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    • MLDs were not affected by cortical lesions but were frequently abnormally small in patients with eight-nerve tumor, Meniére's disease, or multiple sclerosis.
    • Abnormally small MLDs were observed in individuals with normal pure-tone and speech sensitivity but subcortical central lesions, suggesting diagnostic potential.
    • MLD test reliability was compromised in individuals with hearing loss or significant interaural threshold differences.

    Conclusions:

    • MLD tasks demonstrate diagnostic value in identifying retrocochlear lesions, especially when pure-tone and speech sensitivity are normal.
    • MLDs may aid in detecting subcortical central auditory processing disorders.
    • MLD testing's effectiveness is limited in cases of hearing loss or asymmetric hearing thresholds, hindering differentiation between cochlear and retrocochlear pathologies.