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Fig. 13.14. Contour completion process with different kinds of connections. Networks without afferent connections to the gap area (a) and without lateral excitatory connections to this area (b) were tested in the contour completion task. In both cases, the MUA sequences for the four input contour elements (rows 1-2 and 4-5) are synchronized, whereas the sequences for the gap (row 3) are silent, suggesting that filling in did not occur. Contour completion therefore requires both kinds of connections.