Figure 1.

Frequency of main clinical features. Frequency of main clinical features in the 98 participants included in this study. Venn diagram illustrating the overlap between motor speech impairment, agrammatism (either expressive or receptive) and reduced speech fluency (A), apraxia of speech, dysarthria, expressive and receptive agrammatism, and reduced speech fluency (words per minute, WPM) (B). Only one participant was not found to have impaired performance according to the thresholds defined in this study in any of the main clinical features included in this figure. This participant was diagnosed with non-fluent/agrammatic variant primary progressive aphasia (nfvPPA) because the treating physician noted mild expressive agrammatism.