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Controlled and automatic memory process in Alzheimer's disease

R G Knight1

  • 1Department of Psychology, University of Otago, Dunedin, New Zealand. rknight@psy.otago.ac.nz

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|July 21, 1998
PubMed
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Alzheimer's patients show severe impairment in conscious memory recall. Their remaining memory relies significantly on automatic (unconscious) processes, which are also reduced but show overlap with healthy individuals.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Alzheimer's disease (AD) significantly impacts memory functions.
  • Distinguishing between conscious and unconscious memory is crucial for understanding cognitive decline in AD.

Purpose of the Study:

  • To investigate the roles of controlled (conscious) and automatic (unconscious) memory in Alzheimer's disease patients.
  • To compare memory performance in AD patients and healthy elderly individuals using a stem-completion task.

Main Methods:

  • Utilized the process dissociation procedure (Jacoby, 1991) to estimate conscious and unconscious memory contributions.
  • Employed a stem-completion recall task for persons with Alzheimer's disease and a matched healthy elderly group.

Related Experiment Videos

Main Results:

  • Recollection (conscious memory) was severely impaired in Alzheimer's patients.
  • Automatic processing (unconscious memory) was also reduced in AD patients, with performance overlap observed.
  • Residual memory capacity in Alzheimer's patients was substantially supported by automatic memory processes.

Conclusions:

  • Conscious memory recall is a primary deficit in Alzheimer's disease.
  • Automatic memory processes play a critical compensatory role in the memory performance of individuals with Alzheimer's disease.