| Change in perceived spatial directions due to context. | |
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MedLine Citation:
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PMID: 10909243 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We examined the influence of context on exocentric pointing. In a virtual three-dimensional set-up, we asked our subjects to aim a pointer toward a target in two conditions. The target and the pointer were visible alone, or they were visible with planes through each of them. The planes consisted of a regular grid of horizontal and vertical lines. The presence of the planes had a significant influence on the indicated direction. These changes in indicated direction depended systematically on the orientation of the planes relative to the subject and on the angle between the planes. When the orientation of the (perpendicular) planes varied from asymmetrical to symmetrical to the frontoparallel plane, the indicated direction varied over a range of 15 degrees--from a slightly larger slant to a smaller slant--as compared with the condition without the contextual planes. When the dihedral angle between the two planes varied from 90 degrees to 40 degrees, the indicated direction varied over a range of less than 5 degrees: A smaller angle led to a slightly larger slant. The standard deviations in the indicated directions (about 3 degrees) did not change systematically. The additional structure provided by the planes did not lead to more consistent pointing. The systematic changes in the indicated direction contradict all theories that assume that the perceived distance between any two given points is independent of whatever else is present in the visual field--that is, they contradict all theories of visual space that assume that its geometry is independent of its contents (e.g., Gilinsky, 1951; Luneburg, 1947; Wagner, 1985). |
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Authors:
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N Schoumans; J J Koenderink; A M Kappers |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Perception & psychophysics Volume: 62 ISSN: 0031-5117 ISO Abbreviation: Percept Psychophys Publication Date: 2000 Apr |
Date Detail:
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Created Date: 2000-09-19 Completed Date: 2000-09-19 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0200445 Medline TA: Percept Psychophys Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 532-9 Citation Subset: IM |
Affiliation:
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Delft University of Technology, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Depth Perception* Discrimination Learning Female Field Dependence-Independence* Humans Male Optical Illusions* Orientation* Pattern Recognition, Visual Psychomotor Performance* Psychophysics |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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