Panel a: Persistent Stimulus-to-Response sites exhibiting a category effect in the Antonym Generation as well as the Visual and Auditory Categorization tasks (N=7 participants). Panel b: Representative Persistent Stimulus-to-Response sites showing a category effect in the Visual Categorization task (dog, N=91 vs. cat, N=90) and a part of speech effect in the Antonym Generation task (noun, N=78 vs. adjective, N=69). Shading on each trace indicates s.e.m. across trials for each time point. Black bold segments along the x-axis indicate significant differences between traces (p<0.01 for at least 100 ms). Panel c: Persistent Stimulus-to-Response sites active during both the Word Repetition and Antonym Generation tasks (overlap, N=24) or active only during the Antonym Generation task (unique, N=24). Panel b: Onsets of Persistent Stimulus-to-Response HG activity averaged across overlap sites in Word Repetition, overlap sites in Antonym Generation, and unique sites in Antonym Generation (S3: Noverlap=11, Nunique=6; S15: Noverlap=6, Nunique=11; S18: Noverlap=10, Nunique=7). Error bars denote s.e.m. across sites.