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Fig. 5.11. Retinotopic organization of the orientation map. The center of gravity of the afferent weights of every second neuron was calculated and plotted in the retinal space, and those of neighboring neurons connected with lines (as in Figure 4.8). The overall organization of the map is an evenly spaced grid with local distortions. These distortions result from mapping both orientation and retinal position smoothly into the same two-dimensional surface; such distortions have been found experimentally on animal maps as well (Das and Gilbert 1997).