Effect of rod-cone interactions on mesopic visual performance mediated by chromatic and luminance pathways.
We studied the effect of rod-cone interactions on mesopic visual reaction time (RT). Rod and cone photoreceptor excitations were independently controlled using a four-primary photostimulator. It was observed that (1) lateral rod-cone interactions increase the cone-mediated RTs; (2) the rod-cone interactions are strongest when rod sensitivity is maximal in a dark surround, but weaker with increased rod activity in a light surround; and (3) the presence of a dark surround nonselectively increased the mean and variability of chromatic (+L-M, S-cone) and luminance (L+M+S) RTs independent of the level of rod activity. The results demonstrate that lateral rod-cone interactions must be considered when deriving mesopic luminous efficiency using RT.
Andrew J
AJ
Zele
Michelle L
ML
Maynard
Daniel S
DS
Joyce
Dingcai
D
Cao
D003118:Color Perception / Q000502:physiology*; D006801:Humans; D011601:Psychophysics; D011930:Reaction Time; D017949:Retinal Cone Photoreceptor Cells / Q000166:cytology; D017948:Retinal Rod Photoreceptor Cells / Q000166:cytology; D055258:Rod-Cone Interaction / Q000502:physiology*