Figure 1.

PCA results. Factor scores of LPA patients on the speech production and verbal memory factor (i.e. Factor 1) and visuospatial and executive factor (i.e. Factor 2) emerging from the varimax-rotated PCA. Coloured data points indicate individual patients who were examined in pairwise fashion in subsequent statistical analyses, with matching colours denoting patient pairs of interest. Gold lines indicate lower bound of normality (−1.96 standard error from the mean) as estimated from the Control group (calculation detailed in Supplementary material). LPA = logopenic progressive aphasia.