title: The effects of photopigment depletion on brightness and threshold.
mesh_terms: D000221:Adaptation, Ocular; D003623:Dark Adaptation; D004192:Discrimination, Psychological; D006801:Humans; D012168:Retinal Pigments / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*
chemical_list: D012168:Retinal Pigments