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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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Objectless Motion

Objectless Motion

The Pedestalled Motion Paradigm

Chapter:
(p.573) Chapter 79 Objectless Motion
Source:
The Oxford Compendium of Visual Illusions
Author(s):

George Sperling

Zhong-Lin Lu

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0079

The sum of two sine waves of the same frequency is yet another sine wave. When a moving sinewave grating (e.g., continuously translating from left to right) is added to (superimposed on) a stationary sinewave grating (the pedestal) with twice the amplitude, the sum is a sine-wave grating that wobbles back and forth. Remarkably, the left–right direction of the moving grating can be perceived just as accurately in pedestalled motion as in normal motion. At temporal frequencies of 10 Hz and greater, the wobble is too quick to be perceived. The moving pedestalled sine-wave grating is perceived as an invisible left-to-right horizontal wind above the summed sine-wave grating that wobbles back and forth at low temporal frequencies of motion but appears to be absolutely stationary at high temporal frequencies.

Keywords:   pedestalled motion, objectless motion, sine wave, sine-wave grating, motion

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