| Perceived rigidity and nonrigidity in the kinetic depth effect. | |
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MedLine Citation:
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PMID: 8474832 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Stroboscopic simulations of three-dimensional rotating rigid structures can be perceived as highly nonrigid. To investigate this nonrigidity effect a sequence of either three (experiment 2 and 3) or thirty six frames (experiment 4) was used, each consisting of a set of dots with location on the horizontal axis corresponding to the parallel projection of a nominally defined helix. Observers were asked to judge the angle of rotation of eighty helices defined by the factorial combination of eight phase (phi) values (ie difference between the sinusoidal path of one dot and its neighbours) and ten different angular displacement values (alpha). When in each static frame the dots can be organized into curved dotted line (small values of phi), the perceived 3-D helices are highly nonrigid. But when shape information is not available in each static frame (high values of phi), the helices are perceived as rigid and rotation judgement is possible providing that alpha < 15 degrees. It appears that at small values of phi observers fail to recover the rigid structure of the helices since the input to the structure from the motion process may be distorted. |
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Authors:
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G Ganis; C Casco; S Roncato |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Perception Volume: 22 ISSN: 0301-0066 ISO Abbreviation: Perception Publication Date: 1993 |
Date Detail:
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Created Date: 1993-05-18 Completed Date: 1993-05-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0372307 Medline TA: Perception Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 23-34 Citation Subset: IM |
Affiliation:
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Dipartimento di Psicologia Generale, Università di Padova, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Depth Perception Female Form Perception* Humans Male Motion Rotation* Visual Perception* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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