Apraxia of speech and phonological errors in the diagnosis of nonfluent/agrammatic and logopenic variants of primary progressive aphasia

Karen Croot*, Kirrie Ballard, Cristian E. Leyton, John R. Hodges

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    53 Citations (Scopus)

    Abstract

    Purpose: The International Consensus Criteria for the diagnosis of primary progressive aphasia (PPA; Gorno-Tempini et al., 2011) propose apraxia of speech (AOS) as 1 of 2 core features of nonfluent/agrammatic PPA and propose phonological errors or absence of motor speech disorder as features of logopenic PPA. We investigated the sensitivity and specificity of AOS and phonological errors as markers for these variants and also investigated the relationship between AOS, phonological errors, and findings on C-labeled Pittsburgh Compound B (PiB)-positron emission tomography (PET) imaging associated with putative Alzheimer-type pathology. Method: Connected speech and word repetition in 23 people with PPA who underwent PiB-PET imaging were rated for apraxic versus phonological disruption by 1 rater who was blind to diagnosis and by 2 raters who were blind to PiB-PET results. Results: Apraxic characteristics had high sensitivity for nonfluent/ agrammatic PPA, and phonological errors had high sensitivity for logopenic PPA; however, phonological errors showed lower specificity for logopenic PPA. On PiB imaging, 8 of 9 people with predominant AOS returned negative results, whereas participants with no or questionable AOS with and without phonological errors returned positive results. Conclusions: Attention to AOS and phonological errors may help counter some of the inherent limitations of diagnosis-byexclusion in the current International Consensus Criteria for diagnosing PPA.

    Original languageEnglish
    Pages (from-to)S1562-S1572
    Number of pages11
    JournalJournal of Speech, Language, and Hearing Research
    Volume55
    Issue number5
    DOIs
    Publication statusPublished - 1 Oct 2012

    Keywords

    • Alzheimer's disease
    • Apraxia of speech
    • Brain imaging
    • Frontotemporal dementia
    • Nonfluent progressive aphasia
    • Phonological errors
    • Speech production

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