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Updated: Jul 8, 2026

Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping
Published on: August 12, 2019
Neuropathology-specific language features in primary progressive aphasia
Jane Stocks1,2, Elena Barbieri2,3, Michelle Anne Los2
1Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.
Introduction:
Primary Progressive Aphasia (PPA) clinical syndromes do not align consistently with underlying pathology. This study aimed to identify language markers for specific neuropathologies using both standard clinical tests and narrative speech analysis.
Methods:
We analyzed data from 82 autopsy-confirmed PPA cases, including Alzheimer's disease (AD), transactive DNA-binding protein 43 (TDP-43) type C (TDP-C), Pick's disease, and 4R-tauopathies (progressive supranuclear palsy/ cortico-basal degeneration (PSP/CBD). Linear mixed-effects regression was used to analyze performance on standardized aphasia tests and narrative speech variables.
Results:
TDP-C showed severe semantic deficits but high fluency, while AD was distinguished by impaired repetition. Narrative analysis differentiated 4R-Tauopathies: CBD patients demonstrated significantly poorer syntax and irregular verb inflection than PSP or Pick's, whereas PSP showed the lowest fluency.
Discussion:
While standard tests effectively capture lexical-semantic features in AD and TDP-C, narrative measures reveal subtle grammatical and fluency differences critical for distinguishing specific tauopathies. This study outlines a more robust approach for predicting underlying pathology in PPA.
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