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Interhemispheric suppression: a test of central auditory function.

M Bergman, S Hirsch, P Solzi

    Ear and Hearing
    |April 1, 1987
    PubMed
    Summary
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    Brain-damaged adults with cerebrocranial injury (CCI) and cerebrovascular accident (CVA) often show auditory processing deficits. These functional communication disorders persist despite normal audiological and aphasia test results.

    Area of Science:

    • Neuroscience
    • Audiology
    • Speech and Language Pathology

    Background:

    • Brain injury, including cerebrocranial injury (CCI) and cerebrovascular accident (CVA), can lead to subtle communication impairments.
    • Routine audiological evaluations and aphasia tests may not detect all functional communication disorders in brain-injured individuals.

    Purpose of the Study:

    • To investigate auditory processing disorders in patients with CCI and CVA using the competing sentences test.
    • To identify central auditory dysfunction that may be missed by standard audiological and aphasia assessments.

    Main Methods:

    • Administered the Willeford competing sentences test to adult patients with CCI and CVA.
    • Compared performance of CCI and CVA patients to normal controls on auditory processing tasks.

    Related Experiment Videos

  • Analyzed ear-specific responses and overall performance on competing message tests.

    • Main Results:

    • 43% of CCI patients exhibited abnormal auditory responses, often with left ear suppression or extinction.
    • CCI patients performed significantly worse than controls on competing message tests.
    • CVA patients with right hemisphere lesions showed left ear suppression; left hemisphere lesions led to bilateral score reductions.

    Conclusions:

    • Brain-damaged individuals can possess central auditory processing deficits undetectable by standard tests.
    • These auditory processing impairments have significant implications for daily living and rehabilitation strategies.
    • The competing sentences test is valuable for uncovering functional communication disorders in brain-injured populations.