Voltage signal of photoreceptors at visual threshold.
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D004594:Electrophysiology; D008027:Light; D010786:Photoreceptor Cells / Q000502:physiology*; D009435:Synaptic Transmission; D014426:Turtles; D014785:Vision, Ocular