Document Detail


Judging spatial properties of simple figures.
MedLine Citation:
PMID:  18407313     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Jacob Nachmias
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial     Date:  2008-04-14
Journal Detail:
Title:  Vision research     Volume:  48     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-05-12     Completed Date:  2008-07-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1290-6     Citation Subset:  IM    
Affiliation:
Department of Psychology, University of Pennsylvania, Room 302C, 3401 Walnut Street, Philadelphia, PA 19104, USA. nachmias@psych.upenn.edu
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MeSH Terms
Descriptor/Qualifier:
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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