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A Thickness Illusion: Horizontal Is Perceived as Thicker than Vertical

1
Bureau Roffa, 3023 DL Rotterdam, The Netherlands
2
Department of Experimental and Applied Psychology, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
3
Institute for Brain and Behaviour, 1081 BT Amsterdam, The Netherlands
4
School of Psychology, University of Sydney, Sydney, NSW 2006, Australia
*
Author to whom correspondence should be addressed.
Received: 8 November 2018 / Revised: 23 November 2018 / Accepted: 26 December 2018 / Published: 4 January 2019
We report two psychophysical experiments that investigate a visual illusion that is considered common knowledge among type designers, but has never been studied scientifically. Specifically, the thickness of a horizontal line is overestimated in relation to that of a vertical line. Experiment 1 confirmed the existence of the illusion. In Experiment 2, we replicated the effect and showed that the illusion is closely related to the vertical-horizontal illusion, in which the length of a vertical line is overestimated in comparison to a horizontal one. Both the overestimation of thickness and length is larger when the stimulus is surrounded by a horizontally elongated frame, as opposed to a vertically elongated frame. We discuss potential explanations for the thickness illusion and its relation to the vertical-horizontal illusion. View Full-Text
Keywords: illusion; vision; orientation; perception illusion; vision; orientation; perception
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De Waard, J.M.; Van der Burg, E.; Olivers, C.N.L. A Thickness Illusion: Horizontal Is Perceived as Thicker than Vertical. Vision 2019, 3, 1.

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