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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
Open AccessArticle

Three-part Oppel-Kundt illusory figure

Institute of Biology, Kaunas University of Medicine, Lithuania
Author to whom correspondence should be addressed.
Medicina 2009, 45(11), 871;
Received: 29 December 2008 / Accepted: 6 November 2009 / Published: 11 November 2009
The Oppel-Kundt illusion was examined in the psychophysical experiments with the classical two-part stimuli and modified three-part figures. The modified versions comprised either one filled medial interval and two empty flanking intervals or one empty space situated in between two fillings. The illusion was measured as a function of the number of filling elements in the referential parts of the figures. The curves obtained by two modified figures and by the original two-part stimulus were quite similar in shape, but the magnitudes of the illusions differed significantly. The figure with two filled intervals yielded about twice-stronger illusory effect than the contrasting figure with a single filled and two empty intervals. The two-part stimulus showed the illusion magnitudes in the midst. Our assumption suggests the illusory effect being related particularly to overestimations of the filled interval when compared with the empty interval displayed side-to-side. The unfilled interval might not contribute to the illusion.
Keywords: filled-space illusion; length matching filled-space illusion; length matching
MDPI and ACS Style

Bertulis, A.; Surkys, T.; Bulatov, A.; Gutauskas, A. Three-part Oppel-Kundt illusory figure. Medicina 2009, 45, 871.

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