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The relationship between perceived length and egocentric location in Muller-Lyer figures with one versus two chevronsWe examined the apparent dissociation of perceived length and perceived position with respect to the Muller-Lyer (M-L) illusion. With the traditional (two-chevron) figure, participants made accurate open-loop pointing responses at the endpoints of the shaft, despite the presence of a strong length illusion. This apparently non-Euclidean outcome replicated that of Mack, Heuer, Villardi, and Chambers (1985) and Gillam and Chambers (1985) and contradicts any theory of the M-L illusion in which mislocalization of shaft endpoints plays a role. However, when one of the chevrons was removed, a constant pointing error occurred in the predicted direction, as well as a strong length illusion. Thus, with one-chevron stimuli, perceived length and location were no longer completely dissociated. We speculated that the presence of two opposing chevrons suppresses the mislocalizing effects of a single chevron, especially for figures with relatively short shafts.
Document ID
20050184541
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Welch, Robert B.
(NASA Ames Research Center Moffett Field, CA United States)
Post, Robert B.
Lum, Wayland
Prinzmetal, William
Date Acquired
August 23, 2013
Publication Date
October 1, 2004
Publication Information
Publication: Perception & psychophysics
Volume: 66
Issue: 7
ISSN: 0031-5117
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center ARC
NASA Discipline Neuroscience

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