Summation of rod and cone responses at absolute threshold.
Visual thresholds were measured for rod stimuli, cone stimuli and mixtures of rod and cone stimuli. Comparisons of the rod and cone thresholds to the corresponding components of the mixed-stimulus thresholds revealed summation between subthreshold rod and cone responses. The amount of summation was less than linear addition but greater than either probability summation of orthogonal vector addition.
D006801:Humans; D008959:Models, Neurological; D010786:Photoreceptor Cells / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*