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[Number processing and acalculia in dementia].

E Kalbe1, J Kessler

  • 1Max-Planck-Institut für neurologische Forschung Gleueler Str. 50 50931 Köln, Germany. Elke.Kalbe@pet.mpin-koeln.mpg.de

Zeitschrift Fur Gerontologie Und Geriatrie
|June 26, 2002
PubMed
Summary

Acalculia, or difficulty with calculation, is a common symptom of dementia that worsens with disease severity. Specific number processing and calculation tests may aid in dementia diagnosis.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Context:

  • Dementia is a progressive neurological disorder impacting cognitive functions.
  • Number processing and calculation abilities are often affected in neurodegenerative diseases.
  • Existing diagnostic criteria for dementia may not fully capture the spectrum of cognitive deficits.

Purpose:

  • To review and synthesize current research on number processing and calculation deficits in patients with dementia.
  • To identify characteristic patterns and specific error types associated with acalculia in dementia.
  • To evaluate the potential utility of acalculia assessment in dementia diagnosis.

Summary:

  • Acalculia is a frequent symptom of dementia, correlating with disease severity.
  • Deficits in calculation and numeral transcoding are often apparent early, while semantic and basic number processing impairments may be less pronounced initially.
  • Demented patients exhibit unique "shift errors" or "intrusion errors" in number transcoding, such as mixing number codes.

Impact:

  • Highlights acalculia as a significant and specific symptom in dementia.
  • Suggests integrating acalculia assessment into dementia diagnostic criteria.
  • Recommends the use of number processing and calculation tests for improved dementia diagnosis and characterization.

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