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Exploring the validity of mild cognitive impairment (MCI) subtypes: multiple-domain amnestic MCI is the only

Shannon Zofia Klekociuk1, Mathew James Summers

  • 1a School of Psychology , University of Tasmania , Launceston , TAS , Australia.

Journal of Clinical and Experimental Neuropsychology
|March 4, 2014
PubMed
Abstract

Insights

The multiple-domain amnestic (a-MCI+) subtype of mild cognitive impairment (MCI) shows distinct cognitive deficits. Current neuropsychological testing may not reliably differentiate single-domain MCI subtypes from healthy individuals.

Area of Science:

  • Neuroscience
  • Gerontology
  • Cognitive Psychology

Background:

  • Epidemiological research identified mild cognitive impairment (MCI) as a risk factor for Alzheimer's dementia.
  • Distinct MCI subtypes have been proposed, but their diagnostic validity is uncertain.

Purpose of the Study:

  • To examine the longitudinal neuropsychological profiles of MCI subtypes.
  • To assess the diagnostic validity of proposed MCI subtypes through comprehensive neuropsychological testing.

Main Methods:

  • 118 adults aged 60-90 years were classified into amnestic (a-MCI), nonamnestic (na-MCI), and multiple-domain amnestic (a-MCI+) subtypes.
  • Participants underwent comprehensive neuropsychological assessments at two time points over 20 months.

Main Results:

  • The a-MCI+ group exhibited the poorest performance across episodic memory, working memory, attention, and executive functioning.
  • Significant cognitive differences were observed between the a-MCI+ group and other subtypes/healthy controls.

Conclusions:

  • The a-MCI+ subtype is identifiable through neuropsychological testing.
  • Differentiating single-domain MCI subtypes from healthy controls using current neuropsychological assessments is challenging and may not be feasible.

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