Figure 1.

Cone inputs to the receptive fields of macaque LGN cells. A, Cell excited by increments in S-cone activation (S+). B, Cell excited by decrements in S-cone activation (S−). C, P-cell. Each panel shows a peristimulus time histogram of discharge during square-wave modulation of a spatially uniform field (temporal frequency of 0.5 Hz; diameter of 8°). Responses have been folded to one cycle of modulation and are the average of at least six cycles. Panels in each row show, from top to bottom, responses to modulation of L-cones alone, M-cones alone, and S-cones alone. Dashed line shows maintained discharge.