| Judging spatial properties of simple figures. | |
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MedLine Citation:
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PMID: 18407313 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Discrimination was measured for height, area, and aspect ratio of ovals and rectangles. Random jittering of the orthogonal property (width, aspect ratio, and area) was used to control the observers' criterion. Weber fractions for aspect ratio were consistently lower than those for area, and about the same as those for height. Performance with ovals and rectangles did not differ significantly. Two different methods were employed to assess the side effects of jittering. It was found that jittering reduces the discriminability of each property, though less for aspect ratio than for height or area. The hypothesis that judgements of both area and aspect ratio are linear combination of noisy estimates of height and width predicts Weber fractions for aspect ratio and for area to be 2(1/2) times higher than those for height. Results from unjittered trials clearly reject the hypothesis with respect to aspect ratio but not for area. |
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Authors:
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Jacob Nachmias |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial Date: 2008-04-14 |
Journal Detail:
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Title: Vision research Volume: 48 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-05-12 Completed Date: 2008-07-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 1290-6 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Pennsylvania, Room 302C, 3401 Walnut Street, Philadelphia, PA 19104, USA. nachmias@psych.upenn.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Discrimination (Psychology) Field Dependence-Independence Form Perception / physiology* Humans Judgment* Motion Perception / physiology Psychometrics Psychophysics |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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