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Fig. 14.5. Self-organized SOM afferent weights. The fuzzy digit-like images display the afferent weights for each unit in the 20 × 20 map, in gray scale from white to black (low to high). The SOM has a regular global organization with local clusters sensitive to each digit category. For example, the lower right corner is sensitive to inputs of digit 1, and this preference gradually changes to 7 and then to 4 along the right edge of the map.