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FIG 4. Group composite maps compare the three stimulus types (see Methods). The red-yellow scale indicates brain regions that were more active (P = .001) when letters were compared with shapes (L vs S, column 1), when letters were compared with numbers (L vs N, column 2), or when numbers were compared with shapes (N vs S, column 3). The blue-purple scale represents brain regions that were active (P = .001) when shapes were compared with letters (column 1), when numbers were compared with letters (column 2), or when shapes were compared with numbers (column 3). 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: mfg indicates middle frontal gyrus; acg, anterior cingulate gyrus; prcg, precentral gyrus; ips, intraparietal sulcus; sfg, superior frontal gyrus; ifg, inferior frontal gyrus; c, caudate nucleus; sog, superior occipital gyrus; ins, insula; bg, basal ganglia; stg, superior temporal gyrus; R, right; L, left.
