Fig. 2.

(Top panel) Treated items for all 36 PPA participants. (Bottom panel) Untreated items for all 36 PPA participants. Phase 1 of treatment is on the left and phase 2 is on the right. Blue lines, tDCS effects; red lines, sham effects. The graphs depict the absolute therapy gain in terms of the percentage of change from baseline condition. Bars at each time point represent 1 standard deviation from the mean. The numbers at each follow-up time indicate the number of participants at that time. Average effects and P values of the GEE statistic are calculated in the last column of the tables. Abbreviations: GEE, generalized estimating equation; PPA, primary progressive aphasia; tDCS, transcranial direct current stimulation.