Figure 1.

Ventral views and coronal sections through the orbital frontal cortex of a macaque brain. Left panels depict in gray the intended lesions to mainly target areas 11 and 13 as reconstructed onto a ventral view and three coronal levels. Right panels depict the extent of lesion for case O-asp-6 shown in a photograph of the orbital frontal surface (top) and revealing the exposed underlying white matter in the areas where the cortex was aspirated. Below are photographs of histological sections through the orbital frontal cortex at three coronal levels. The numerals on the left of the coronal sections indicate the distance in millimeters from the interaural plane. cs, Cingulate sulcus; G, gustatory cortex; Ia, insular (agranular); ias, inferior arcuate sulcus; los, lateral orbital sulcus; mos, medial orbital sulcus; Pir, piriform cortex; PrCO, precentral opercular area; ps, principal sulcus; rs, rostral sulcus; VP, ventral pallidum. Cytoarchitectonic fields are as described by Barbas and Pandya (1989), Amaral et al. (1992), and Carmichael and Price (1994).