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Spatial Vision , Vol. 15, No. 2, pp. 191– 203 (2002) Ó VSP 2002. Going round in circles: shape effects in the Ebbinghaus illusion DAVID ROSE 1 ; ¤ and PAOLA BRESSAN 2 1 Department of Psychology, University of Surrey, Guildford, Surrey GU2 7XH, UK 2 Dipartimento di Psicologia Generale, Università di Padova, 35131 Padova, Italy Received 25 January 2001; revised 10 June 2001; accepted 13 June 2001 Abstract —The Ebbinghaus illusion has traditionally been considered as either a sensory or a cognitive illusion, or some combination of these two. Cognitive contrast explanations take support from the way the illusion varies with the degree of shape similarity between the test and inducing elements; we show, however, that contour interaction explanations may account for this result too. We therefore tested these alternative theories by measuring the illusion with different test shapes as well as different inducer shapes, in all combinations. We found that for angular or hexagonal test shapes there is no similarity effect, and for some shape combinations there is no signi cant illusion, in contradiction to both of the traditional hypotheses. Instead, we suggest that an integrated model of visual processing is needed to account for the
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 2002
Keywords: EBBINGHAUS ILLUSION; VISUAL ILLUSIONS; COGNITIVE CONTRAST
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