title: Spatial frequency effects in masking by light.
mesh_terms: D000221:Adaptation, Ocular; D003213:Conditioning, Psychological; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010470:Perceptual Masking / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors