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Auditory potentials in profoundly deaf subjects.

K Ribarić, I Padovan, T S Prevec

    Acta Oto-Laryngologica
    |March 1, 1985
    PubMed
    Summary
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    Middle latency response (MLR) was recorded in healthy volunteers but rarely in deaf subjects. MLR appeared only in two prelingually deaf individuals with normal vestibular function, suggesting a link between hearing, vestibular function, and auditory processing.

    Area of Science:

    • Neuroscience
    • Audiology
    • Otoacoustic Emissions

    Background:

    • The middle latency response (MLR) is an auditory evoked potential reflecting neural activity in the brainstem and midbrain.
    • Profound deafness can impact auditory pathway function, but MLR characteristics in deaf individuals are not fully understood.

    Purpose of the Study:

    • To investigate the presence and characteristics of middle latency responses (MLR) in individuals with profound deafness.
    • To explore the relationship between the onset of deafness (prelingual vs. postlingual) and MLR generation.
    • To examine the potential correlation between MLR and vestibular function in deaf subjects.

    Main Methods:

    • A 500 Hz filtered click stimulus was delivered via bone conduction to the mastoid.
    • Auditory evoked potentials, specifically MLR, were recorded in 12 healthy volunteers and 10 profoundly deaf subjects (5 prelingual, 5 postlingual).

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  • Vestibular function was assessed in all participants.

    • Main Results:

    • MLR was consistently recorded in all healthy volunteers.
    • MLR was observed in only two subjects with prelingual profound deafness.
    • These two subjects with prelingual deafness and recorded MLR were also the only ones with normal vestibular function.

    Conclusions:

    • The presence of MLR in profoundly deaf individuals is rare and may be associated with prelingual deafness and preserved vestibular function.
    • Findings suggest that auditory processing pathways contributing to MLR may remain partially functional in some prelingually deaf individuals, potentially linked to vestibular system integrity.
    • Further research is warranted to elucidate the mechanisms underlying MLR generation in deaf populations and its relationship with vestibular status.