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Contrast polarities determine the direction of Café Wall tilts

Pinna, Baingio and Kitaoka, Akiyoshi and Brelstaff, Gavin James (2004) Contrast polarities determine the direction of Café Wall tilts. Perception, Vol. 33 (1), p. 11-20. eISSN 1468-4233. Article.

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DOI: 10.1068/p3346


We propose an explanatory approach to Café Wall type illusions that is simple yet fairly comprehensive. These illusions are constructed out of basic elementary units in a jigsaw-like manner. Each unit, in general, contains both a solid body and a thin tail: the contrast polarity between the two determines the direction of the contributory illusory tilt produced by that element -- according to a heuristic rule illustrated in figure 1. Ensembles of these elements exhibit illusory tilts only when the tails of the elements align along a common line in an additive manner. When elements of opposing polarity alternate, the illusion is cancelled. This approach extends and supersedes those presented in Pinna's illusion of angularity and Kitaoka's 'acute' corner effect. Furthermore, it appears to be, in part, compatible with existing mechanisms proposed to account for the emergence of local tilt cues, and it suggests several novel variations on the Café Wall theme.

Item Type:Article
ID Code:2390
Uncontrolled Keywords:Café Wall type illusions, corner effect
Subjects:Area 11 - Scienze storiche, filosofiche, pedagogiche e psicologiche > M-PSI/01 Psicologia generale
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze dei linguaggi
002 Altri enti e centri di ricerca del Nord Sardegna > CRS4 Center for Advanced Studies, Research and Development in Sardinia, Pula
Deposited On:18 Aug 2009 10:07

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