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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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Auditory threshold, phonologic demand, and incident dementia.

John Gallacher1, Victor Ilubaera, Yoav Ben-Shlomo

  • 1Institute of Primary Care and Public Health, Cardiff University, Cardiff, Wales, UK. Gallacher@cf.ac.uk

Neurology
|September 29, 2012
PubMed
Summary

Elevated auditory threshold (hearing loss) is linked to increased risk of dementia and cognitive decline over 17 years. This association remained significant even after accounting for prior cognitive function.

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Area of Science:

  • Gerontology
  • Neuroscience
  • Audiology

Background:

  • Cognitive decline and dementia are significant public health concerns, particularly in aging populations.
  • Auditory function is crucial for communication and social engagement, and its decline may impact cognitive processes.

Purpose of the Study:

  • To investigate the longitudinal association between auditory threshold and the risk of cognitive decline and dementia.
  • To explore potential relationships between hearing impairment and cognitive aging.

Main Methods:

  • A 17-year prospective cohort study of 1,057 men from the Caerphilly cohort.
  • Pure-tone audiometry at 0.5, 1, 2, and 4 KHz assessed at baseline and 9 years.
  • Incident dementia (including vascular and Alzheimer's disease) and cognitive decline were evaluated using standardized criteria and test batteries.

Main Results:

  • A higher mean age-adjusted auditory threshold was significantly associated with increased risk of incident dementia and cognitive decline.
  • The association with dementia persisted after adjusting for baseline cognitive function (OR=2.67 for 0.5 KHz).
  • Cognitive decline showed stronger associations with hearing loss when assessed via interview compared to computer-based tests.

Conclusions:

  • This study demonstrates a significant association between auditory threshold and the development of dementia and cognitive decline over a 17-year period.
  • The underlying mechanisms remain unclear, with possibilities including early dementia effects on hearing, hearing's impact on cognitive testing, or shared underlying causes.