Visual adaptation: a case of nonlinear summation.
D000221:Adaptation, Ocular; D000818:Animals; D003400:Astacoidea; D003623:Dark Adaptation; D004594:Electrophysiology; D066298:In Vitro Techniques; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology*