Variations in apparent spatial frequency with stimulus orientation: I. Incidence of the effect in the general population.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D009903:Optical Illusions / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D011601:Psychophysics; D013028:Space Perception / Q000502:physiology*