FIG 3. Regional brain activation when subjects judged the order of letters, numbers, or shapes. The images represent group composite activation maps comparing order trials with identify trials within a particular stimulus type. The red-yellow scale indicates brain regions that were more active in the order trials than in the identify trials (P = .001). The blue-purple scale represents brain regions that were active in the identify trials than in the order trials (P = .001). Rows a–e indicate the section position along the z axis of the Talairach atlas system (40, 32, 24, 12, and 4, respectively). The legend for activation is as follows: sfg indicates superior frontal gyrus; acg, anterior cingulate gyrus; mfg, middle frontal gyrus; prcg, precentral gyrus; ips, intraparietal sulcus; ifg, inferior frontal gyrus; pcu, precuneus; smg, supramarginal gyrus; sog, superior occipital gyrus; cu, cuneus; ins, insula; bg, basal ganglia; c, caudate nucleus; stg, superior temporal gyrus; mtg, middle temporal gyrus; cf, calcarine fissure; mog, middle occipital gyrus; lg, lingual gyrus; R, right; L, left.