Effects on relay-cell spatial impulse-response function from mixed excitatory and inhibitory feedback.

<p><i>Top row</i>: dependence on cortical feedback widths and with weights kept fixed: and . <i>Bottom row</i>: dependence on cortical feedback weights and with widths kept fixed: , and . All values are normalized with respect to the case where relay cells only receive feedforward excitation from retinal ganglion cells. The parameters in <i>W</i>_G and <i>K</i>_RG are kept fixed (see <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1006156#pcbi.1006156.t001" target="_blank">Table 1</a>).