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Related Experiment Video

Updated: Feb 2, 2026

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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Mild Cognitive Impairment that Does Not Progress to Dementia: A Population-Based Study.

Mary Ganguli1,2,3, Yichen Jia1,4, Tiffany F Hughes5

  • 1Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.

Journal of the American Geriatrics Society
|November 17, 2018
PubMed
Summary

Most individuals with mild cognitive impairment (MCI) do not progress to dementia. This study identified distinct characteristics for MCI subgroups, including those who stabilized, reverted to normal cognition, or progressed to dementia, highlighting the heterogeneity of MCI.

Keywords:
agingcognitionepidemiology

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Area of Science:

  • Gerontology
  • Neurology
  • Cognitive Science

Background:

  • Mild cognitive impairment (MCI) is a transitional state between normal cognition and dementia.
  • Most individuals with MCI do not progress to dementia, but rather remain stable or revert to normal cognition.
  • Understanding the heterogeneity of MCI is crucial for predicting outcomes and developing targeted interventions.

Purpose of the Study:

  • To characterize subgroups of mild cognitive impairment (MCI) based on their 5-year outcomes.
  • To identify distinct baseline characteristics associated with different MCI trajectories (progression to dementia, stable MCI, reversion to normal cognition).
  • To shed light on the underlying causes and heterogeneity of MCI in a population-based cohort.

Main Methods:

  • A population-based cohort of 1603 individuals was analyzed.
  • Mild cognitive impairment (MCI) was defined as Clinical Dementia Rating (CDR) = 0.5, and dementia as CDR ≥ 1.
  • Multinomial logistic regression models compared MCI subgroups (progressors, stable, reverters) to a consistently normal group, examining associations with baseline characteristics including cognitive scores, medical conditions, and APOE genotype.

Main Results:

  • Worse subjective cognitive concerns, functional impairments, self-rated health, and depressive symptoms were associated with any MCI group.
  • The APOE4 genotype was linked to stable and progressive MCI; stroke was associated with progressive MCI.
  • Reverters were less likely to have memory and visuospatial impairments, while all MCI subgroups showed lower cognitive domain scores.

Conclusions:

  • Mild cognitive impairment (MCI) subgroups with different 5-year outcomes exhibit distinct characteristics, suggesting varied underlying etiologies.
  • Progressive MCI showed a profile consistent with Alzheimer's disease, whereas stable MCI was associated with vascular factors.
  • These findings underscore the significant heterogeneity of MCI in the general population.