Contrast reduction by small localized stimuli: extensive spatial spread of above-threshold orientation-selective masking.
D005260:Female; D005403:Fixation, Ocular; D005556:Form Perception; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D009949:Orientation; D010364:Pattern Recognition, Visual; D014792:Visual Acuity; D014794:Visual Fields