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Fig. 5.5. Initial V1 afferent and lateral weights. These plots show the initial weights of the V1 neuron at location (79,68) in the 142 × 142 V1 map. As in Figure 4.3, each set of weights is outlined in black and plotted in gray scale on nthe neural region from which they originate; however, the padding in the LGN is omitted so that the area of (a) corresponds to that of Figure 5.6b. The neuron itself is marked with a small white square in (b) and (c). The afferent RFs were initially random, as shown in (a); the ON and OFF channel weights were identical for each neuron. Plots (b) and (c) display the lateral weights of this neuron; initially they had a Gaussian profile. Later figures will show how these connections become selective and patchy through self-organization.