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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Semantic memory for object concepts relies on visual feature knowledge and integration in heteromodal regions.
  • Alzheimer's disease (AD) is associated with semantic deficits, but the underlying neural mechanisms require further investigation.

Purpose of the Study:

  • To test the hypothesis that semantic memory involves modality-specific and heteromodal cortex, and their interconnectivity.
  • To examine neural correlates of semantic processing in mild AD using fMRI and diffusion-weighted MRI.

Main Methods:

  • fMRI was used to assess brain activation during semantic judgments of object features (shape, color) in mild AD patients and healthy seniors.
  • Diffusion-weighted MRI measured white matter integrity (fractional anisotropy) in specific fasciculi.
  • Participants judged visual-perceptual feature matches between word pairs (natural kinds, manufactured objects).

Main Results:

  • Mild AD patients showed reduced activation in bilateral ventral temporal cortex and left dorsolateral prefrontal cortex compared to controls.
  • AD patients exhibited less ventral temporal activation for manufactured objects but not natural kinds.
  • Reduced fractional anisotropy was observed in the superior longitudinal and inferior frontal-occipital fasciculi of AD patients.

Conclusions:

  • Semantic memory is supported by a large-scale neural network including association cortices and their white matter projections.
  • Semantic deficits in AD stem from gray matter damage affecting feature knowledge and white matter damage disrupting network integration.
  • Findings highlight the impact of both gray and white matter pathology on semantic memory in Alzheimer's disease.