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Related Experiment Videos

PB rollover and the acoustic reflex

M Hannley, J Jerger

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1981
    PubMed
    Summary

    Acoustic neurinoma patients lacking acoustic reflexes showed greater speech intelligibility rollover. This suggests a neural-mechanical interaction in retrocochlear eight-nerve disorders impacting auditory processing.

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    Area of Science:

    • Audiology
    • Neuroscience
    • Otolaryngology

    Background:

    • Acoustic neurinoma, a tumor on the eighth cranial nerve, can affect hearing and balance.
    • Speech understanding is crucial for quality of life, and its impairment is a significant concern for patients.

    Purpose of the Study:

    • To investigate the relationship between acoustic reflex status and speech understanding in patients with acoustic neurinoma.
    • To explore the impact of retrocochlear auditory pathway disorders on speech intelligibility.

    Main Methods:

    • Retrospective study of 52 patients with surgically confirmed acoustic neurinoma.
    • Patients categorized into three groups based on acoustic reflex presence (all present, all absent, abnormal).
    • Comparison of pure-tone sensitivity, PBmax, and speech intelligibility rollover across groups.

    Main Results:

    • Groups were homogeneous in pure-tone sensitivity and PBmax.
    • Subjects with absent acoustic reflexes exhibited significantly greater speech intelligibility rollover at high intensities.
    • This rollover effect was less pronounced in subjects with intact or partially intact acoustic reflexes.

    Conclusions:

    • Absence of acoustic reflexes is associated with increased difficulty in speech understanding at high sound levels in acoustic neurinoma patients.
    • A neural-mechanical interaction is proposed as a potential mechanism underlying speech intelligibility rollover in retrocochlear disorders.
    • Findings highlight the importance of assessing acoustic reflexes for understanding speech processing deficits in eighth nerve tumors.

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