Cite as:
Kitaoka A, 1998, "Apparent contraction of edge angles" Perception 27(10) 1209 – 1219
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Apparent contraction of edge angles

Akiyoshi Kitaoka

Received 3 February 1997, in revised form 27 April 1998

Abstract. The corner effect, the Münsterberg illusion, and the Café Wall illusion are explained by a model postulating that the corner effect is an orientation illusion specific to corner edges and that the perceived orientations of these edges are shifted toward angle contraction. It is also assumed that the effect is greatest when the corner edges show the same or similar edge contrast at the corner. This model yields three new types of illusions: the 'checkered illusion', the 'illusion of shifted gradations', and the 'illusion of striped cords'. Each of them gives many variations making a three-dimensional impression.

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