Visual detection of patterns periodic in two dimensions.
D000328:Adult; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D008959:Models, Neurological; D009949:Orientation; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010507:Periodicity; D014785:Vision, Ocular; D014792:Visual Acuity