Demographic and formal testing data presented for logopenic and nonfluent variant Primary Progressive Aphasia groups and healthy controls with statistical comparisons between the logopenic and nonfluent variant groups for continuous variable reported.

Ns = nonsignificant; *** p<0.001; 1 All fluent English speakers premorbidly, by self or family report; 2 3 logopenic and 3 nonfluent participants reported cataracts, one reported a macular tear; polysyllable words were repeated after the examiner and all patients were able to read the Grandfather Passage (large font) unassisted; the number of affected cases is balanced across patient groups; 3 Pittsburgh compound B positron emission tomography scanning using cut-off of 1.5 for neocortical standardized uptake value ratios; 4 Cases of nonfluent PPA without clinical diagnosis of AOS are included, as acoustic measures may be more sensitive than perceptual judgments to motor speech behaviors [38]; 5 Frontotemporal Lobar Degeneration-modified Clinical Dementia Rating Scale with score >3 indicating impairment [45], data available for 12 controls; 6 Lower limit of normal performance is 28/30 for 60–69 year olds and 27/30 for 70–79 year olds [69], data available for 12 controls.