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Longitudinal changes in temporal speech measures in nfvPPA and lvPPA groups. lvPPA, logopenic variant primary progressive aphasia; nfvPPA, non-fluent variant primary progressive aphasia; PVI, pairwise variability index; Duration is measured in milliseconds; SW, strong–weak stressed words (e.g. dinosaur); WS, weak–strong stressed words (e.g. banana). See Supplementary materials for data separated by presence of AOS and dysarthria within diagnostic groups.
