Figure 2.

(A) Fundus projection of differential rod and cone mechanism sensitivities to size III targets under mesopic conditions. Gridlines are separated by 6°; each circle represents the fundus-projected location in the visual field; relative quantal catches for white stimulus incident on the photoreceptor layer (see Appendix) are depicted by pie charts at each location (black corresponds to absorption by rods; blue corresponds to S-cones; gray to absorption by (M+L)-cones); insets demonstrate spectral sensitivity (mean of three observers ± SEM) with best-fitting template combinations (see text) and their adjusted R² values. Targets at peripheral locations are detected by rods and (M+L)-cones while more central targets are detected by a combination of S-cones and (M+L)-cones. (B) Fundus projection of differential rod and cone mechanism sensitivities to size V targets under mesopic conditions. Gridlines are separated by 6°; each circle represents the fundus-projected location in the visual field; relative quantal catches for white stimulus incident on the photoreceptor layer (see Appendix) are depicted by pie charts at each location (black corresponds to absorption by rods; blue corresponds to S-cones; gray to absorption by (M+L)-cones); insets demonstrate spectral sensitivity (mean of three observers ± SEM) with best-fitting template combinations (see text) and their adjusted R² values. Targets at peripheral locations are detected by rods and (M+L)-cones while more central targets are detected by a combination of S-cones and (M+L)-cones.