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Fig. 5.23. Combined OR/DR map. Using the plotting conventions from Figure 5.4, each of the 142 × 142 neurons in the LISSOM OR/DR map is colored with its preferred orientation, and the direction preferences for every third neuron are plotted as arrows overlaid on the orientation map. The direction preferences are generally perpendicular to the preferred orientation, and large iso-orientation patches are often divided into two areas with opposite direction preferences. Such an organization matches experimental data well (Figure 5.4; Weliky et al. 1996). An animated version of this plot can be seen at ...