Figure 3.

Brain areas activated. Areas of significant signal change are shown as color overlays on the averaged axial structural images (transformed to the atlas of Talairach and Tournoux, ref. 8). Images are oriented according to radiologic convention (the right side of the brain is on the left side of the image, anterior-posterior is shown top to bottom). The distance of the displayed slice above the AC-PC line is shown below each image. Areas where activation increased when subjects processed categorical patterns are shown in red and yellow. Areas where activation decreased during the processing of categorical patterns are indicated in blue.