Metacontrast in the fovea.
D000328:Adult; D005260:Female; D005403:Fixation, Ocular; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008266:Macula Lutea / Q000502:physiology*; D008297:Male; D010470:Perceptual Masking / Q000502:physiology*; D012399:Rotation; D014796:Visual Perception / Q000502:physiology*