title: Metacontrast as a function of spatial separation with narrow line targets and masks.
mesh_terms: D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D010470:Perceptual Masking; D013028:Space Perception / Q000502:physiology*; D013997:Time Factors; D014785:Vision, Ocular; D014792:Visual Acuity