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Nonepisodic memory deficits in amnestic MCI

Alexandra Economou1, Sokratis G Papageorgiou, Clementine Karageorgiou

  • 1Department of Psychology, School of Philosophy, University of Athens, Athens, Greece. aoikono@psych.uoa.gr

Cognitive and Behavioral Neurology : Official Journal of the Society for Behavioral and Cognitive Neurology
|June 15, 2007
PubMed
Abstract

Insights

Cognitive impairments beyond memory, including complex motor tasks, are present in early Alzheimer's disease (AD) and Mild Cognitive Impairment (MCI). These motor tasks may help detect dementia early, independent of education level.

Area of Science:

  • Neuroscience
  • Gerontology
  • Cognitive Psychology

Background:

  • Episodic memory deficits are key in preclinical Alzheimer's disease (AD).
  • AD is characterized by multi-domain cognitive impairments years before diagnosis.
  • Nonepisodic memory functions are also affected in early AD stages.

Purpose of the Study:

  • Compare cognitive performance in amnestic Mild Cognitive Impairment (MCI), mild AD, and healthy elderly individuals on non-episodic memory tasks.
  • Identify cognitive measures unaffected by education level for early dementia detection.

Main Methods:

  • Compared 31 MCI patients, 15 mild AD patients, and 27 controls on tasks of fluid intelligence, working memory, processing speed, verbal fluency, and visual-perceptual/motor functions.
  • Used multivariate analyses of covariance controlling for age, education, and sex.
  • Validated findings with a psychometrically defined MCI subgroup.

Main Results:

  • MCI patients showed deficits in fluid intelligence, working memory, processing speed, semantic fluency, visual-perceptual, and complex motor functions compared to controls.
  • Mild AD patients exhibited worse performance than MCI patients in working memory, processing speed, semantic fluency, and complex motor tasks.
  • Complex motor tasks and semantic fluency were significantly impaired in both MCI and mild AD groups.

Conclusions:

  • Broad cognitive impairments, not just episodic memory, characterize the preclinical stage of AD.
  • Complex motor tasks are independent of education and show potential for early dementia detection.
  • These findings highlight the utility of non-memory cognitive assessments in identifying early AD and MCI.

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