1988 volume 17(1) pages 65 – 70
doi:10.1068/p170065

Cite as:
Greene E, 1988, "The corner Poggendorff" Perception 17(1) 65 – 70
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The corner Poggendorff

Ernest Greene

Received 7 March 1988

Abstract. With the classic Poggendorff illusion a set of parallel 'induction lines' will cause a set of oblique line segments to look misaligned even though they are collinear. A different kind of misalignment can be produced by placing the induction lines so that they form a corner. Under these conditions the obliques will appear to be angled slightly, one relative to the other. The effects are small, but can be seen and reliably reported by a group of naive subjects. The influence of the induction lines drops sharply as their relative position is moved from parallel to orthogonal, but there is a small residual influence which may be called the corner Poggendorff effect.

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