Sighting-down and the Poggendorff illusion: a mystery within a mystery.
As reported before, sighting-down one of the diagonal lines on a typical Poggendorff pattern will reduce the illusion even if that situation is only pictorial. But here it is also argued that sighting-down itself requires further understanding.
Parks
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Department of Psychology, University of California, Davis 95616.
D003867:Depth Perception; D004215:Distance Perception; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D009903:Optical Illusions