Figure 18

Figure 18. The contribution of negative feedback from L-type horizontal cells to the photoresponses of cones in the turtle retina. Red and green cones were stimulated with either small field or large field stimuli of either red or green light. The contribution of the negative feedback from the L-type horizontal cells was most apparent in the recording from the green cone stimulated with a large field red light stimulus. The illustration is from Perlman et al., 1985 (172). The blue cone from the retina of the turtle (Mauremys caspica) was stimulated with a red (700nm) light stimulus covering a large retinal area in the dark-adapted state (trace 1) and during red (trace 2) or blue (trace 3) background lights. Depolarizing feedback signals from red cone stimulation are most apparent on the blue background (trace 3). The illustration is from Itzhaki et al., 1992 (187)

From: S-Potentials and Horizontal Cells

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