Cite as:
Roncato S, 2006, "Orientation misperceptions induced by contrast polarity: Comment on “Contrast polarities determine the direction of Café Wall tilts” by Akiyoshi Kitaoka, Baingio Pinna, and Gavin Brelstaff (2004)" Perception 35(3) 401 – 409
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Orientation misperceptions induced by contrast polarity: Comment on “Contrast polarities determine the direction of Café Wall tilts” by Akiyoshi Kitaoka, Baingio Pinna, and Gavin Brelstaff (2004)

Sergio Roncato

Received 29 April 2004, in revised form 1 June 2005; published online 6 February 2006

Abstract. According to Kitaoka et al (2004, Perception 33 11 – 20), the Café Wall illusion can be reduced to misalignment effects produced locally by a large shape on a line passing nearby. I demonstrate here that the interacting units are edges and not whole shapes, and that the source of the illusion does not consist in a local tilt but in a tendency of the edges to join when they have the same contrast polarity.

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