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Related Experiment Videos

Semantic memory in Alzheimer's disease.

R D Nebes

    Psychological Bulletin
    |November 1, 1989
    PubMed
    Summary

    Alzheimer's disease patients show significant semantic memory impairments, affecting word finding and concept knowledge. This review examines their performance on various semantic memory tests and influencing cognitive factors.

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Gerontology

    Background:

    • Alzheimer's disease (AD) is often associated with cognitive decline.
    • Semantic memory, the knowledge of concepts and words, may be particularly vulnerable in AD.
    • Understanding these deficits is crucial for diagnosis and care.

    Purpose of the Study:

    • To review the semantic memory performance in Alzheimer's disease patients.
    • To explore how semantic context affects cognitive processes in AD.
    • To discuss theoretical explanations for variability in semantic tasks.

    Main Methods:

    • Review of studies assessing Alzheimer's patients on semantic memory tests.
    • Analysis of performance on word finding, attribute knowledge, and category membership.
    • Examination of semantic and lexical priming effects.
    • Discussion of implicit memory and automaticity theories.

    Main Results:

    • Alzheimer's patients exhibit distinct semantic memory impairments compared to healthy older adults.
    • Performance varies across different semantic memory tasks.
    • Semantic context influences cognitive processes like priming and memory encoding in AD.

    Conclusions:

    • Semantic memory deficits are a key feature of Alzheimer's disease.
    • Factors like implicit memory and automaticity may explain performance variability.
    • Further research is needed to fully understand the nuances of semantic processing in AD.

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