Early visual perception.
D000818:Animals; D003867:Depth Perception / Q000502:physiology; D005556:Form Perception / Q000502:physiology; D006801:Humans; D008959:Models, Neurological; D009039:Motion Perception / Q000502:physiology; D012684:Sensory Thresholds; D014796:Visual Perception / Q000502:physiology*