| Size invariance in visual number discrimination. | |
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MedLine Citation:
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PMID: 1792300 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study deals with the observer's ability to discriminate the numerosity of two random dot-patterns irrespective of their relative size. One of these two patterns was a reference one that was always composed of 32 dots randomly distributed within a K x K invisible square window (K = 1.92 degrees). The second one was the test pattern with one of the five magnifications (K = 0.64 degrees, 1.28 degrees, 1.92 degrees, 2.56 degrees, 3.20 degrees) and the relative number of dots varied on 11 levels (N = -15, -12, -9, -6, -3, 0, 3, 6, 9, 12, or 15 dots). The observer's task was to indicate which of the two patterns contained more dots. The results show that the stimulus size, as an irrelevant stimulus attribute, can be ignored in the judgements about relative numerosity. This means that the perceived numerosity is size invariant, at least for a 1.6-times magnification and a 3-times reduction of the test pattern. The size invariance observed constrains the range of potential models, since the perceived numerosity can be identified only by means of a feature of the stimulus that will remain invariant after any change in the absolute stimulus size. |
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Authors:
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J Allik; T Tuulmets; P G Vos |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Psychological research Volume: 53 ISSN: 0340-0727 ISO Abbreviation: Psychol Res Publication Date: 1991 |
Date Detail:
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Created Date: 1992-04-01 Completed Date: 1992-04-01 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0435062 Medline TA: Psychol Res Country: GERMANY |
Other Details:
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Languages: eng Pagination: 290-5 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Jyväskylä, Finland. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Attention* Discrimination Learning* Humans Orientation* Pattern Recognition, Visual* Psychophysics Size Perception |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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