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Related Experiment Videos

Asymmetrical memory decline in normal aging and dementia

J S Janowsky1, R A Carper, J A Kaye

  • 1Department of Neurology, Oregon Health Sciences University, Portland 97201-3098, USA. JANOWSKJ@OHSU.EDU

Neuropsychologia
|June 1, 1996
PubMed
Summary

Normal aging affects verbal memory more than nonverbal memory, unlike Alzheimer's disease (AD). This study differentiates age-related memory changes from AD, highlighting a distinct asymmetrical pattern in healthy aging.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Gerontology

Background:

  • Age-associated memory impairment (AAMI) and Alzheimer's disease (AD) both impact memory.
  • It remains unclear if these memory impairments affect verbal and nonverbal domains similarly.

Purpose of the Study:

  • To compare the pattern of memory impairment in normal aging versus Alzheimer's disease (AD).
  • To determine if verbal and nonverbal memory are affected differently by aging.

Main Methods:

  • Participants learned object identity and location.
  • Memory recall was tested for both object identity (verbal) and location (nonverbal).
  • Retention intervals were adjusted to equate performance between younger and older participants.

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Main Results:

  • Memory decline with age is not uniform across all domains.
  • Verbal memory showed a greater decline than nonverbal memory in older adults.
  • This asymmetrical pattern was observed in normal aging, not characteristic of Alzheimer's disease.

Conclusions:

  • Normal aging disproportionately affects verbal memory compared to nonverbal memory.
  • The asymmetrical memory decline observed is a hallmark of healthy aging, distinct from Alzheimer's disease pathology.