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Related Experiment Videos

Semantic activation and implicit memory in Alzheimer disease.

J Brandt1, M Spencer, P McSorley

  • 1Johns Hopkins University School of Medicine, Baltimore, MD.

Alzheimer Disease and Associated Disorders
|January 1, 1988
PubMed
Summary

Alzheimer disease (AD) patients show significant deficits in both implicit and explicit verbal memory. These findings suggest memory impairments in AD extend beyond traditional memory systems.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Alzheimer disease (AD) is characterized by severe explicit verbal memory deficits.
  • Previous research has not fully explored implicit memory functions in AD patients.

Purpose of the Study:

  • To investigate whether implicit verbal memory is preserved in patients with probable Alzheimer disease (AD).
  • To compare implicit memory performance in AD patients with that of normal individuals.

Main Methods:

  • Assessed free recall of a word list in moderately demented AD patients and a control group.
  • Evaluated word association performance as a measure of implicit memory.

Main Results:

  • AD patients exhibited severe impairment in free recall.

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  • AD patients were significantly less likely to use recalled words in a subsequent word association task.
  • The memory activation effect was reduced in AD patients but uncorrelated with cognitive measures.

    • Conclusions:

    • Both implicit and explicit verbal memory are impaired in Alzheimer disease.
    • Memory activation in AD may involve neural circuits distinct from the temporo-limbic system.