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Updated: Aug 14, 2026

Focal Cerebral Ischemia Model by Endovascular Suture Occlusion of the Middle Cerebral Artery in the Rat
13:50

Focal Cerebral Ischemia Model by Endovascular Suture Occlusion of the Middle Cerebral Artery in the Rat

Published on: February 5, 2011

Impact of subcortical ischemic lesions on behavior and cognition

Etsuro Mori1

  • 1Institute for Aging Brain and Cognitive Disorders, Hyogo Brain and Heart Center, 520 Saisho-ko, Himeji 670-0981, Japan. mori@hiabcd.go.jp

Annals of the New York Academy of Sciences
|December 14, 2002
PubMed

Insights

Vascular cognitive impairment and Alzheimer's disease (AD) often coexist in older adults. White matter changes in AD are vascular in origin and impact specific symptoms, not overall cognitive decline.

Area of Science:

  • Neurology
  • Geriatrics
  • Pathology

Background:

  • Cerebrovascular disease and Alzheimer's disease (AD) are prevalent in the elderly.
  • Vascular cognitive impairment (VCI) presents diverse tissue/vessel damage and neural mechanisms.
  • Small subcortical infarcts and white matter lesions are common VCI subtypes, often co-occurring.

Purpose of the Study:

  • To explore the interplay between vascular and degenerative mechanisms in cognitive impairment in the elderly.
  • To differentiate the roles of small subcortical lesions and white matter changes in cognitive dysfunction.
  • To investigate the nature of white matter changes in AD patients.

Main Methods:

  • Analysis of lesion types (small subcortical infarcts, white matter lesions) and their locations (thalamus, caudate, globus pallidus).
  • Examination of disrupted neural circuits (cortico-subcortical, frontal-subcortical, memory-related).
  • Correlation of white matter changes with clinical manifestations in dementia patients (AD, VaD, or mixed).

Main Results:

  • Small subcortical lesions disrupting cortico-subcortical circuits lead to cognitive dysfunction.
  • Disruption of frontal-subcortical circuits causes frontal lobe-predominant cognitive impairment; memory circuit disruption leads to amnesia.
  • White matter changes in AD are superimposed vascular phenomena, contributing to specific neurological/neuropsychiatric symptoms but not global cognitive decline.

Conclusions:

  • Cognitive impairment in the elderly results from combined vascular and degenerative processes.
  • White matter changes in AD are of vascular origin and affect specific symptoms, distinct from the degenerative process driving global cognitive impairment.
  • Understanding these distinct contributions is crucial for diagnosing and managing cognitive decline in aging populations.

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