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Linking hippocampal structure and function to memory performance in an aging population.

Christiane Reitz1, Adam M Brickman, Truman R Brown

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Hippocampal volume loss impacts memory recall early in Alzheimer's disease. Reduced entorhinal cortex blood flow (CBV) is linked to delayed recall, suggesting early functional decline in memory.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Medical Imaging

Background:

  • Alzheimer disease (AD) is associated with hippocampal atrophy and reduced cerebral blood volume (CBV), but the timing of these changes is unclear.
  • Magnetic resonance imaging (MRI) is utilized to evaluate hippocampal structure and function.

Purpose of the Study:

  • To investigate the relationship between hippocampal and entorhinal cortex volumes and CBV with memory function in early and late stages of cognitive impairment.
  • To differentiate the roles of structural and functional changes in memory decline in individuals with and without dementia.

Main Methods:

  • Multivariate regression analyses correlated entorhinal cortex and hippocampal volumes and CBV with memory and language performance.
  • A community-based cohort of 231 elderly Medicare recipients (≥65 years) was studied.

Main Results:

  • Hippocampal volume was associated with total recall, while entorhinal cortex CBV correlated with delayed recall.
  • No association was found between entorhinal cortex volume or hippocampal CBV and memory.
  • In individuals without Alzheimer disease, entorhinal cortex CBV showed a stronger association with memory, and hippocampal volume's link to total recall diminished.

Conclusions:

  • Early-stage Alzheimer disease and cognitive impairment involve hippocampal hypofunction contributing to memory deficits.
  • Later stages of Alzheimer disease show a greater contribution of both functional and structural changes to memory impairment.