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. 2006 Aug 23;26(34):8715–8726. doi: 10.1523/JNEUROSCI.0821-06.2006

Figure 5.

Figure 5.

Spatial summation in retinal ganglion cells. A, Schematic illustrations of stimuli used. Horizontal gratings drifted upward at 4.3 Hz; they were visible through circular apertures (patches) or circular annuli. B, Responses of a PC cell to the annuli (filled circles), patches of luminance grating (2 cycle/°; open circles), and patches of chromatic grating (0.1 cycle/°; open squares). Response to the patches monotonically increases. C, Responses of an MC cell to annuli and patches of luminance grating (1 cycle/°). Responses increase until the patch is a diameter of 0.5°, and then decline. Conventions are as in B. D, Distribution of optimal patch diameter for luminance gratings for PC (filled bars) and MC cells (open bars). E, Diameter at which patch response reaches asymptotic values. The distribution of values for MC cells is shown. F, SI (see Eq. 7) for luminance gratings for PC and MC cells. Values in D–F were determined from fits of Equation 4 to cell responses (smooth lines in B, C).