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The Oxford Compendium of Visual Illusions$
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Arthur G. Shapiro and Dejan Todorovic

Print publication date: 2017

Print ISBN-13: 9780199794607

Published to Oxford Scholarship Online: June 2017

DOI: 10.1093/acprof:oso/9780199794607.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 28 September 2021

The Pitchroom Illusion

The Pitchroom Illusion

How High Is Up?

(p.241) Chapter 25 The Pitchroom Illusion
The Oxford Compendium of Visual Illusions

Leonard Matin

Ethel Matin

Wenxun Li

Todd E. Hudson

Adam Shavit

Oxford University Press

A pitched visual field (i.e., a visual stimulus tilted around a horizontal axis in the observer’s frontal plane) generates profound changes in the elevation visually perceived to correspond to eye level (visually perceived eye level [VPEL]). It also affects the perceived elevation and size of objects viewed against the field. With top-forward pitch (top toward the observer), VPEL lies above true eye level and objects appear smaller and lower; with top-backward pitch (top away from the observer) VPEL lies below true eye level and objects appear larger and higher. This chapter summarizes parametric studies of the spatial and temporal properties of multimodal factors that influence the illusion and describes a three-stage neuromathematical model that accounts for the effects.

Keywords:   visually perceived eye level, VPEL, elevation, true eye level, top-forward pitch, top-backward pitch, temporal properties, spatial

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