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Induced motion may account for the illusory transformation of optic flow fields found by Duffy and Wurtz.

Authors
  • Meese, T S
  • Smith, V
  • Harris, M G
Type
Published Article
Journal
Vision Research
Publisher
Elsevier
Publication Date
Apr 01, 1995
Volume
35
Issue
7
Pages
981–985
Identifiers
PMID: 7762154
Source
Medline
License
Unknown

Abstract

Duffy and Wurtz [(1993) Vision Research, 33, 1481-1490] found an illusory shift in the position of the focus of expansion (FOE) of random dot patterns when planar motion was superimposed on expanding radial motion. Subjects indicated that this illusory shift was in the direction of the planar motion. This is the opposite direction to a true shift in the FOE that is perceived when the planar motion is vector summed with the expanding motion. We account for this illusion by suggesting that planar motion induces opposite motion on the expanding dots which after vector summation produces the illusory shift in the FOE. We use a matching technique with a method of adjustment to measure induced motion and perceived FOE in moving random dot patterns and present the results in support of our assertion.

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