Abstract

We assessed how rod excitation (R) affects luminance (L $+$ M $+$ S) and chromatic [L/(L $+$ M)] reaction times (RTs). A four-primary display based on the overlapped images of two spectrally modified monitors, which allowed specific or combined [L $+$ M $+$ S $+$ R, L/(L $+$ M) + R] photoreceptor stimulation, was used to present a C-target stimulus differing from the background only by the selected stimulation. For the luminance pathway, rod input increased RTs, suggesting a suppressive rod–cone interaction. The responses of the chromatic pathway were faster when rods were involved, suggesting a major role of rods in mesopic color perception.

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