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Fig. 13.15. Contour completion performance with different kinds of connections. The average correlation coefficients for the four MUA sequences representing the four input contour elements vs. the MUA sequence representing the gap are shown, calculated over two trials. Both afferent and excitatory connections are included in "Both". In "Lateral", the afferent connections are removed from the center, i.e. binding is due to excitatory lateral connections only. In "Afferent", the excitatory lateral connections are removed from the center, and binding is based on afferent connections only. The plot shows that both afferent and excitatory contributions are necessary for contour completion (p < 10^-7).