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Percepts of rigid motion within and across aperturesHumans consistently err in their percepts of rotational motion viewed through an aperture. Such errors provide insight into the constraints observers use to interpret retinal images. In the first of two experiments, Ss consistently perceived the fixed center of rotation for an unmarked line viewed through an aperture as located on the line, regardless of its actual location. Accuracy greatly improved with visible line endings. This finding was extended to explain why a square appears nonrigid when it rotates behind a partial occluder. This illusion may result from observers misperceiving the center of rotation of the unmarked square sides. In this situation, Ss seemed unable to apply an object rigidity constraint across apertures. These findings support a conceptualization of the visual system in which consistent local information must be clearly present before prior knowledge can be used to interpret retinal stimulation.
Document ID
19920051291
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shiffrar, Maggie
(Stanford University CA, United States)
Pavel, M.
(New York University NY, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Journal of Experimental Psychology: Human Perception and Performance
Volume: 17
Issue: 3 19
ISSN: 0096-1523
Subject Category
Behavioral Sciences
Accession Number
92A33915
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-84-0308
CONTRACT_GRANT: NCC2-269
Distribution Limits
Public
Copyright
Other

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