Figure 3. Supra-areal visuotopic organisation of primate visual cortex. A, Lateral view of the right hemisphere of a marmoset monkey, illustrating the anatomical relationships within the cortical region shown in part B. In generating this figure parts of the cerebral cortex normally hidden from view (those located along the dorsal midline and ventral surface) have been graphically "unfolded"; moreover, an artificial discontinuity has been introduced along the horizontal meridian representation in V1 (arrows). The grey lines indicate the boundaries of cortical areas, according to a scheme of subdivision based on physiological mapping and architecture (6,10,29). B, Magnified view of the same map, with the visual topography indicated. The thick dashed lines indicate the dorsal and ventral limits of the cortex that is normally exposed on the dorsal and lateral surfaces of the brain. The numbers to the left of V1 indicate the range of receptive field centre eccentricities observed within the regions coded by the different tones of grey (0-2º, 2-4º, 4-8º, etc.). Representations of the horizontal meridian are indicated by white circles, representations of the vertical meridian by black squares, representations of the upper quadrant by the "+" signs, and those of the lower quadrant by the "-" signs. Although it is likely that visuotopy extends beyond the areas shown in this figure, the detailed organisation of these maps has not yet been established in the marmoset. POm, parietooccipital medial area; M, medial visual area; DM, dorsomedial area; DA, dorsoanterior visual area; DI, dorsointermediate visual area; MT, middle temporal visual area; MTc, middle temporal crescent; ITc, caudal subdivision of the inferior temporal visual area.