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Olfactory dysfunction in Down's Syndrome

C Murphy1, S Jinich

  • 1San Diego State University, Department of Psychology, CA 92182, USA.

Neurobiology of Aging
|July 1, 1996
PubMed
Summary
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Older adults with Down syndrome exhibit significant olfactory dysfunction, including deficits in odor detection, identification, and memory. This olfactory impairment may signal early brain changes and cognitive decline in this population.

Area of Science:

  • Neuroscience
  • Gerontology
  • Genetics

Background:

  • Older adults with Down syndrome (DS) exhibit neuropathology resembling Alzheimer's disease (AD).
  • The olfactory system is notably vulnerable in AD, affecting both structure and function.
  • Investigating olfactory function in DS may reveal early markers of neurodegeneration.

Purpose of the Study:

  • To assess olfactory sensory and cognitive functioning in older adults with Down syndrome.
  • To test the hypothesis of significant olfactory dysfunction in this demographic.
  • To explore the potential of olfactory deficits as early indicators of brain deterioration.

Main Methods:

  • Compared 23 older adults with Down syndrome to 23 age-matched controls.
  • Administered olfactory tests measuring odor detection threshold, identification, and recognition memory.

Related Experiment Videos

  • Included a taste threshold task to control for task demands.
  • Utilized the Dementia Rating Scale to assess cognitive function.

    • Main Results:

    • Down syndrome subjects scored significantly lower on the Dementia Rating Scale (103 vs. 141).
    • Participants with Down syndrome demonstrated significant deficits in odor detection, identification, and recognition memory.
    • Performance on a taste threshold task was comparable, suggesting deficits were specific to olfaction, not task demands.

    Conclusions:

    • Older adults with Down syndrome exhibit profound olfactory dysfunction.
    • Olfactory deficits may serve as sensitive early indicators of neurodegeneration and cognitive decline in Down syndrome.
    • Further research into olfactory function can aid in monitoring brain health in individuals with Down syndrome.