The effect of contrast on the Zöllner illusion.
D006801:Humans; D007088:Illusions; D008297:Male; D008954:Models, Biological; D009433:Neural Inhibition; D009903:Optical Illusions; D009949:Orientation; D014785:Vision, Ocular; D014792:Visual Acuity; D014793:Visual Cortex / Q000502:physiology; D014796:Visual Perception