Figure 4.

Influence of stimulus size on retinal spike contribution. Plots show the relationship between stimulus size and the contribution of retinal spikes in evoking an LGN response (black traces), in which contribution is the percentage of LGN spikes that were evoked by the simultaneously recorded RGC. Cell pairs in A and B are the same as those in Figure 3, A and B. The gray traces show the area summation response function of the simultaneously recorded LGN neuron. C, Unlike efficacy, contribution values remain constant as stimuli extend into the extraclassical receptive field, an effect seen across cell pairs.