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Fig. 1.1. Columnar organization of the primary visual cortex. This classic diagram illustrates an example patch of V1, responsive to one retinotopic location in the visual field. This patch includes an ocular dominance column for each eye, and a set of orientation columns within each ocular dominance column. Orientation preference changes along the length of the area shown, and ocular dominance along its width. Vertically, the receptive field properties are the same. Structures such as blobs, which analyze color, are scattered throughout the columns. Reprinted with permission from Kandel et al. (1991), copyright 1991 by McGraw-Hill.