Two visual systems.
D000818:Animals; D002540:Cerebral Cortex / Q000502:physiology*; D006224:Cricetinae; D004192:Discrimination, Psychological; D009949:Orientation; D003336:Tectum Mesencephali / Q000502:physiology*; D014785:Vision, Ocular; D014793:Visual Cortex / Q000502:physiology