Figure 1.

(A) Response times (means ± SEM) across verb generation trials in 12 subjects generating appropriate verbs while in a PET scanner. PET scans were performed during the naïve, practiced, and novel blocks. (B) Response times (n = 15); (C) visual analog scale rating of anxiety (n = 15); and (D) heart rate (n = 7) measurements for the behavioral study of the verb generation task. All measurements are means ± SEM. Block 0 is reading nouns, block 1 is the first (naïve) verb generation block, and block 11 is verb generation with a novel list of nouns.