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Fig. 5.31. Combined OR/OD/DR map trained with natural images. The combined LISSOM map from natural images is similar to the one in Figure 5.29. More of the units are selective for orientations near horizontal and vertical, so the map has more red and cyan than with artificial training inputs. Not as many neurons are highly selective for direction, but many of the selective patches are located next to other patches selective for the same orientation but opposite direction. Overall, these results are similar to those from artificial stimuli, with greater variability reflecting the more complicated feature correlations in natural images.