Spatial summation of cone mechanisms in goldfish.
Experiments were performed to evaluate the spatial summation areas of the u.v.-, blue-, green- and red-sensitive cone mechanisms of goldfish. All the cone mechanisms were in compliance of Ricco's law, summing target radiance linearly over a certain range of target diameters with an average slope of 2.4. The critical diameters of the blue-, green- and red-sensitive cone mechanisms were all close to 6 deg. However, the critical diameter for the u.v.-sensitive cone mechanism was 8.0 deg, clearly different form than other cone mechanisms. The observation that the u.v.-sensitive cone mechanism has a larger spatial summation area suggests that u.v.-sensitive ganglion cells may have larger receptive field centers.
Hawryshyn
C W
CW
Department of Biology, University of Victoria, British Columbia, Canada.
D000818:Animals; D003118:Color Perception; D006054:Goldfish / Q000502:physiology*; D008027:Light; D010786:Photoreceptor Cells / Q000502:physiology*; D012684:Sensory Thresholds; D013028:Space Perception