Outer excitatory ('disinhibition') surround to receptive fields of retinal ganglion cells.
D000200:Action Potentials; D000818:Animals; D002415:Cats; D009433:Neural Inhibition; D009474:Neurons / Q000502:physiology; D010775:Photic Stimulation; D012160:Retina / Q000502:physiology*; D014794:Visual Fields