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Explicit and implicit memory in dementia and normal ageing.

H Christensen1, P Birrell

  • 1University of New South Wales, Kensington, Australia.

Psychological Research
|January 1, 1991
PubMed
Summary
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Intellectual capacity, not age, influences explicit memory in healthy aging. Alzheimer's dementia patients showed intact priming, challenging existing theories on memory representation.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Investigating memory decline in aging and dementia is crucial for understanding cognitive health.
  • Alzheimer-type dementia (ATD) and healthy aging present distinct memory profiles.
  • The role of pre-existing representations in dementia-related memory deficits requires clarification.

Purpose of the Study:

  • To determine if priming in ATD depends on pre-existing memory representations.
  • To examine if intelligence modulates explicit memory performance in healthy older adults.
  • To compare memory functions across young adults, healthy elderly, elite elderly, and dementia patients.

Main Methods:

  • Two experiments involving explicit and implicit memory tasks.
  • Participants included young subjects, healthy elderly (spouses), elite elderly, and dementia patients.

Related Experiment Videos

  • Tasks included homo-phone spelling, word-stem completion, and recall of word lists and paired associates.

    • Main Results:

    • Dementia patients performed comparably to spouses on implicit tasks (homo-phone spelling) and showed new association formation in word-stem completion.
    • Priming in dementia was not dependent on pre-existing memory representations.
    • Healthy young, elite elderly, and spouses did not differ in implicit memory (stimulus recognition, word-stem completion).
    • Explicit memory (recall of word lists, paired associates) was superior in young and elite elderly compared to spouses.

    Conclusions:

    • Intellectual capacity, rather than chronological age, is a key modulator of explicit memory performance in healthy aging.
    • Findings suggest that priming mechanisms in ATD may operate independently of pre-existing memory stores.
    • Distinctions in explicit memory performance among healthy elderly groups highlight the impact of cognitive reserve.