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Gray matter atrophy pattern in elderly with subjective memory impairment.

Jessica Peter1, Lukas Scheef2, Ahmed Abdulkadir3

  • 1Freiburg Brain Imaging, University Medical Center Freiburg, Freiburg, Germany; Department of Neurology, University Medical Center Freiburg, Freiburg, Germany; Department of Psychology, Laboratory for Biological and Personality Psychology, University of Freiburg, Freiburg, Germany.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|July 23, 2013
PubMed
Summary

Individuals with subjective memory impairment (SMI) show brain patterns similar to Alzheimer's disease (AD). These subtle gray matter changes in SMI may predict future memory decline, highlighting early AD-related brain alterations.

Keywords:
Cognitive declineEarly diagnosingMagnetic resonance imagingPattern recognitionPredictionSubjective memory impairment

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Area of Science:

  • Neuroimaging
  • Cognitive Neurology
  • Biostatistics

Background:

  • Subjective memory impairment (SMI) involves self-reported memory worsening without objective cognitive deficits.
  • Individuals with SMI may face an elevated risk of future cognitive decline compared to those without SMI.
  • Understanding the neurobiological underpinnings of SMI is crucial for early detection and intervention.

Purpose of the Study:

  • To investigate whether individuals with SMI exhibit distinct gray matter patterns.
  • To determine if these gray matter patterns are associated with Alzheimer's disease (AD) characteristics.
  • To explore the relationship between gray matter patterns, cognitive performance, and longitudinal cognitive decline in SMI.

Main Methods:

  • Utilized a support vector machine (SVM) trained on Alzheimer's disease (AD) dementia patients and healthy controls.
  • Applied the trained discriminative function to characterize baseline gray matter patterns in individuals with SMI and control subjects.
  • Examined associations between identified gray matter patterns, baseline cognition, and subsequent cognitive decline.

Main Results:

  • Individuals with SMI displayed gray matter patterns more similar to those observed in Alzheimer's disease (AD) dementia patients than control subjects.
  • A significant association was found between an AD-like gray matter pattern and episodic memory decline within the SMI group.
  • Multivariate pattern recognition successfully identified subtle neuroanatomical differences in SMI.

Conclusions:

  • The study reveals a connection between the gray matter atrophy patterns characteristic of Alzheimer's disease (AD) and the presence of subjective memory impairment (SMI).
  • Multivariate pattern recognition techniques demonstrate sensitivity in detecting subtle brain changes associated with future memory decline in individuals with SMI.
  • These findings suggest that SMI may represent an early stage of AD-related neurodegeneration, detectable through advanced neuroimaging analysis.