Spatial summation of monochromatic light in the visual system.
D000221:Adaptation, Ocular; D003118:Color Perception / Q000502:physiology; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008266:Macula Lutea / Q000502:physiology*; D012684:Sensory Thresholds; D009435:Synaptic Transmission; D014796:Visual Perception / Q000502:physiology*