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Central auditory dysfunction, cognitive dysfunction, and dementia in older people

G A Gates1, J L Cobb, R T Linn

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Washington School of Medicine, Seattle, USA.

Archives of Otolaryngology--Head & Neck Surgery
|February 1, 1996
PubMed
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Central auditory dysfunction, identified by hearing tests, significantly predicts dementia and cognitive decline in older adults. Early detection of hearing loss may serve as a crucial marker for senile dementia.

Area of Science:

  • Gerontology
  • Neuroscience
  • Audiology

Background:

  • Cognitive decline and dementia are significant concerns in aging populations.
  • The relationship between auditory and cognitive functions in older adults requires further investigation.

Purpose of the Study:

  • To investigate the association between auditory dysfunction and cognitive impairment in older individuals.
  • To determine if central auditory test abnormalities predict the onset of clinical dementia or cognitive decline.

Main Methods:

  • A prospective, population-based cohort study was conducted using data from the Framingham Heart Study.
  • Participants with normal cognitive screening at baseline underwent peripheral audiometric testing, word recognition tests, and Synthetic Sentence Identification with Ipsilateral Competing Message (SSI-ICM).

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  • Cognitive function was assessed using the Mini-Mental State Examination and detailed neuropsychological testing; dementia risk was analyzed using Cox proportional hazards regression.

    • Main Results:

    • Hearing loss was significantly associated with lower performance on verbal components of the Mini-Mental State Examination.
    • Very poor SSI-ICM scores (<50%) in one ear increased dementia risk by 6-fold (P = .02).
    • Very poor SSI-ICM scores in both ears increased dementia risk by 12.5-fold (P = .001).

    Conclusions:

    • Central auditory dysfunction can precede senile dementia, serving as an early predictive marker.
    • Hearing assessments are recommended for individuals over 60 and those with suspected cognitive dysfunction.
    • Integrating hearing tests into routine evaluations may aid in early identification of dementia risk.