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Related Experiment Videos

Phonological loop and central executive functioning in Alzheimer's disease.

F Collette1, M Van der Linden, S Bechet

  • 1Neuropsychology Unit, University of Liège, Belgium. f.collette@ulg.ac.be

Neuropsychologia
|July 30, 1999
PubMed
Summary

Alzheimer's disease (AD) patients show deficits in the phonological loop and central executive functions. Lower span AD patients exhibit broader impairments, including basic cognitive processes, suggesting disease progression.

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Area of Science:

  • Cognitive Neuroscience
  • Neurology
  • Psychology

Background:

  • Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
  • Working memory, comprising the phonological loop and central executive, is crucial for cognitive function.

Purpose of the Study:

  • To investigate phonological loop and central executive functioning in Alzheimer's disease (AD).
  • To explore how disease severity, indicated by span level, affects these cognitive functions in AD patients.

Main Methods:

  • Comparison of cognitive task performance between AD patients and normal elderly controls.
  • Stratification of AD patients into high-span and low-span groups for detailed analysis.

Main Results:

  • AD patients demonstrated impaired phonological loop and central executive functions.

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  • Both AD groups showed central executive deficits; only the low-span group had phonological loop dysfunction.
  • Low-span AD patients exhibited deficits in phonological discrimination, articulation rate, and processing speed.

    • Conclusions:

    • Cognitive deficits in AD are linked to disease progression and severity.
    • Higher-span AD patients show impairments in higher-level executive functions.
    • Lower-span AD patients exhibit more fundamental cognitive processing deficits.