Figure 2.

Quantitative 2D maps of metabolic activity in the lateral-frontal cortex. a, Lateral view of a monkey brain with the Cs and the posterior bank of the As unfolded. Dotted lines depict the fundus of the As and that of the Cs. Shaded area indicates the reconstructed cortex. Horizontal lines 1–3 correspond to three different dorsoventral levels of brain sectioning. A, Anterior; D, dorsal; P, posterior; V, ventral. b, Schematic illustration of the geometrically normalized reconstructed cortical field. Black lines correspond to surface landmarks and white lines to cytoarchitectonically identified borders of the labeled cortical areas. Arrows 1–3 indicate the dorsoventral levels of the corresponding lines in a. c, Averaged map from the two hemispheres of the motion-control monkey. d, Averaged map from the right hemispheres (contralateral to the moving forelimb) of the two grasping-execution monkeys. e, Averaged map from the right hemispheres of the three grasping-observation monkeys. Grayscale bar indicates LCGU values in micromoles per 100 g per minute.