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Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
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Using Retinal Imaging to Study Dementia
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Subjective working and declarative memory in dementia and normal aging.

Ove Almkvist1,2, Ole Bosnes3, Ingunn Bosnes3,4

  • 1Department of Neurobiology Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.

Acta Neurologica Scandinavica
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Summary

Patients with dementia report more memory concerns than healthy older adults. Differentiating between working and declarative memory impairments helps distinguish dementia patients from controls.

Keywords:
declarative memorydementiasubjective memoryworking memory

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Area of Science:

  • Neuroscience
  • Gerontology
  • Psychology

Background:

  • Subjective memory complaints are prevalent in aging populations and dementia.
  • Distinguishing between dementia and normal aging is crucial for timely intervention.
  • Self-reported memory issues can be a key indicator, but require careful interpretation.

Purpose of the Study:

  • To assess the utility of subjective memory complaints in differentiating dementia patients from cognitively healthy elderly individuals.
  • To investigate the distinct contributions of declarative and working memory self-perceptions in this differentiation.
  • To explore whether mental and somatic health status influences the diagnostic power of subjective memory.

Main Methods:

  • A matched-pair study design comparing 117 dementia patients and 117 healthy elderly individuals.
  • Utilized data from the HUNT population health survey, including the Meta-Memory Questionnaire (MMQ).
  • Analyzed MMQ components assessing declarative (episodic, semantic) and working memory.

Main Results:

  • Dementia patients reported significantly higher subjective memory concerns than controls.
  • The disparity between working and declarative memory complaints was markedly greater in the dementia group.
  • This difference in memory complaint patterns effectively differentiated the two groups.
  • Comorbid mental and somatic health conditions did not significantly enhance differentiation power.

Conclusions:

  • Self-reported working memory impairment is a more potent differentiator of dementia than declarative memory complaints.
  • Subjective memory components, particularly working memory, can aid in clinical and research differentiation of dementia.
  • Future applications should consider the specific patterns of self-reported memory deficits for improved diagnostic accuracy.