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Fig. 2.5. Hierarchical organization of feature preferences in the macaque. The images illustrate orientation and ocular dominance patches in a 4 mm × 3 mm area of the cortical surface in the macaque monkey, measured through optical imaging. (a) The cells are colored according to their orientation preference as in Figure 2.4a. (b) The same cells are colored in gray scale from white to black according to how strongly they prefer input from the left vs. the right eye. Each neuron is sensitive to a combination of feature values, in this case a line of a particular orientation in the left or the right eye at a particular location on the visual field. These maps are shown superimposed in Figure 5.3, revealing more fine-grained interactions between the maps. Plot (a) reprinted with permission from Blasdel (1992b) and plot (b) from Blasdel (1992a), copyright 1992 by the Society for Neuroscience.