Figure 2. Correlation of a) MD-weighted lesion volume, and b) language-weighted lesion volume with verbal fluency scores.
Verbal fluency residuals are standardized residuals in the regression of Cattell Culture Fair scores against verbal fluency scores (a more negative score indicates poorer performance). Point colour indicates lesion anatomy: frontal (red), parietal (blue), occipitotemporal (green), or parietal and occipitotemporal (black). r is Pearson’s correlation coefficient, P is the corresponding one-tailed P-value of the correlation. r, P, and fit lines are shown for the whole group (N=79). After partialling out variance attributable to IQ, verbal fluency is predicted by the extent to which lesions affect the language, but not the MD, system.