Probability summation and regional variation in contrast sensitivity across the visual field.
D005260:Female; D005403:Fixation, Ocular; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010507:Periodicity; D011336:Probability; D011594:Psychometrics; D012684:Sensory Thresholds / Q000502:physiology; D014792:Visual Acuity