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Fig. 6.9. Retinal activation and V1 response before and after a cortical lesion. The initial and settled responses of the intact network (top row) and the lesioned network (bottom row) to the retinal activation in (a) are shown in (b) and (c), as in Figure 6.6. The cortical lesion is simulated by keeping the input intact but setting the activity of cortical neurons to zero in a central region of the map (indicated by the dotted line in b and c). As with a retinal scotoma, the changes in activity disrupt the dynamic equilibrium and force the network to reorganize.