F_(c(439)), F_(c(501)) and F_(c(616)) equivalent in their action to 502rod elicited identical curves of sensitivity change determined by F_(c(654)) duringthe whole course of RDA. Some questions regarding to rod inhibiting cone arediscussed.

• 对502杆系统作用等效的F_(c(439))、F_(c(501))和F_(c(616))作用后,F_(t(654))的敏感度变化在整个RDA 过程中基本相同。