title: Rod origin of prolonged afterimages.
abstract: Afterimages fade against any unchanging background but generally reappear if the background changes suddenly. Under some conditions, however, a change of background color fails to revive a faded afterimage. This happens only if the interchanged backgrounds equally stimulate the rod receptors. It follows that afterimages seen under these conditions are generated by rods.
mesh_terms: D000360:Afterimage; D003118:Color Perception; D004056:Differential Threshold; D006801:Humans; D008027:Light; D008954:Models, Biological; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology*; D012168:Retinal Pigments / Q000502:physiology; D013997:Time Factors
chemical_list: D012168:Retinal Pigments