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Article

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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MDPI and ACS Style

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. https://doi.org/10.3390/vision3010001

AMA Style

De Waard JM, Van der Burg E, Olivers CNL. A Thickness Illusion: Horizontal Is Perceived as Thicker than Vertical. Vision. 2019; 3(1):1. https://doi.org/10.3390/vision3010001

Chicago/Turabian Style

De Waard, Jasper M., Erik Van der Burg, and Christian N.L. Olivers 2019. "A Thickness Illusion: Horizontal Is Perceived as Thicker than Vertical" Vision 3, no. 1: 1. https://doi.org/10.3390/vision3010001

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