Neuropsychological results and experimental design. a) Test scores were z-transformed. Higher z-values signify better performance. STW, spot-the-word test; DSST, digit symbol substitution test; and TMT trail-making test. ^***P < 0.001, ^**P < 0.01, and ^*P < 0.05. b) The fMRI experiment consisted of task blocks of overt paced semantic fluency and counting, which were presented in a pseudo-randomized order and separated by rest periods. An example for each task is shown. Participants were instructed to produce exactly one exemplar for a category or to say one number when the fixation cross turned green and to pause when the cross turned red. If they could not think of an exemplar, they were instructed to say “next.” Each task block contained 9 trials of the same semantic category/counting task, which were separated by jittered interstimulus intervals.