Next Article in Journal
Long-Range Interocular Suppression in Adults with Strabismic Amblyopia: A Pilot fMRI Study
Previous Article in Journal
Differentiation of Types of Visual Agnosia Using EEG

A Thickness Illusion: Horizontal Is Perceived as Thicker than Vertical

Bureau Roffa, 3023 DL Rotterdam, The Netherlands
Department of Experimental and Applied Psychology, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
Institute for Brain and Behaviour, 1081 BT Amsterdam, The Netherlands
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
Show Figures

Figure 1

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.

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.

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.

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop