Figure 2.

Concurrent validity of the 27 connected speech features. Pearson correlation coefficients are indicated by depth of color, and r values are shown for correlations with uncorrected p < .05. The y axis shows the 27 connected speech features. The x-axis shows the 17 quantitative measures derived from the transcription and coding of the speech samples in AphasiaBank, and the five subscores and the Aphasia Quotient from the Western Aphasia Battery–Revised (WAB-R). Auditory-perceptual rating of connected speech in aphasia (APROCSA) connected speech features were all defined such that high scores are indicative of impairment. The other measures differ in terms of their directionality. In general, the blue color scale is used to encode correlations of scores indicating impairment with scores indicating impairment, whereas the red color scale is used to encode correlations of scores indicating impairment with scores indicating sparing. Exceptions to this are three AphasiaBank quantitative measures—bound morphemes (proportion), closed class words (proportion), and pronouns (proportion)—because these measures can be perturbed in either direction in aphasia (Wilson et al., 2010). The perturbation of these scores in the “agrammatic” direction was arbitrarily defined as the direction of impairment. Yellow boxes indicate AphasiaBank measures that were considered a priori to be measuring the same or related phenomena to each connected speech feature.