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Exploring Abstract Semantic Associations in the Frontotemporal Dementia Spectrum in a Dutch Population.

J M Poos, E van den Berg, E Visch-Brink

    Archives of Clinical Neuropsychology : the Official Journal of the National Academy of Neuropsychologists
    |April 15, 2021
    PubMed
    Summary
    This summary is machine-generated.

    The "Test Relaties Abstracte Concepten" (TRACE) effectively identified impaired abstract semantic knowledge in frontotemporal dementia (FTD) subtypes, particularly semantic variant PPA. This test aids in differentiating FTD subtypes during early diagnosis.

    Keywords:
    AphasiaAssessmentDementiaFrontotemporal dementiaLanguage and language disordersLearning and memory

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Neurology

    Background:

    • Frontotemporal dementia (FTD) encompasses several neurodegenerative disorders affecting behavior and language.
    • Abstract semantic knowledge is crucial for higher cognitive functions and can be impaired in FTD.
    • Current diagnostic tools may not fully capture the nuances of semantic deficits across FTD subtypes.

    Purpose of the Study:

    • To evaluate the diagnostic utility of the "Test Relaties Abstracte Concepten" (TRACE), a Dutch test of abstract semantic knowledge, in various FTD subtypes.
    • To compare the TRACE's performance against a test of concrete semantic knowledge and other neuropsychological assessments.
    • To determine the TRACE's ability to discriminate between FTD subtypes and healthy controls.

    Main Methods:

    • The TRACE was administered to patients diagnosed with behavioral variant FTD (bvFTD), nonfluent variant (nfvPPA), logopenic variant (lvPPA), semantic variant PPA (svPPA), and a control group.
    • Group differences, correlational analyses with other neuropsychological tests, and discriminative ability were examined.
    • The TRACE was compared with a semantic association test for concrete stimuli (SAT).

    Main Results:

    • Patients with bvFTD, lvPPA, and svPPA showed significantly worse performance on the TRACE compared to controls.
    • svPPA patients exhibited the most severe impairment on the TRACE, performing worse than other FTD subtypes.
    • The TRACE demonstrated high sensitivity and specificity in discriminating between svPPA and other FTD groups, and between patient groups and controls (excluding nfvPPA).

    Conclusions:

    • Impaired abstract semantic knowledge is evident in bvFTD, lvPPA, and svPPA, with svPPA being the most affected.
    • The TRACE serves as a valuable tool for differentiating FTD subtypes from controls and distinguishing svPPA from other FTD variants.
    • Integrating abstract semantic tests like the TRACE into neuropsychological assessments can enhance the early differential diagnosis of FTD subtypes.