Document Detail

Conjunction and linear non-separability effects in visual shape encoding.
MedLine Citation:
PMID:  10996614     Owner:  NLM     Status:  MEDLINE    
Four visual search experiments are reported which used simple 2D shapes varying on the global dimensions of aspect ratio/curvature or aspect ratio/tapering. Results indicate serial self-terminating search in all conditions. Most importantly, search rates are markedly modulated by the particular forms of structural relations existing between the targets and their distractors. Thus, single-feature targets with shape properties that are linearly separable from those of their distractors yield markedly faster search rates than linearly separable targets made of a conjunction of distractor features. In addition, linearly separable single-feature targets are searched at a much faster rate than single-feature targets which are not linearly separable. Follow-up experiments demonstrate that these conjunction and linear non-separability effects cannot be attributed to pairwise target-distractor discriminability differences across conditions. The main conclusions are that the shapes used are parsed according to elementary features in visual encoding, and that a linear discrimination mechanism is available which permits fast visual search rates if a single-feature target is linearly separable from its distractors.
M Arguin; D Saumier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  40     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2000  
Date Detail:
Created Date:  2000-11-09     Completed Date:  2000-11-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  3099-115     Citation Subset:  IM    
Groupe de Recherche en Neuropsychologie Expérimentale, Département de Psychologie, Université de Montreal, CP 6128, Succ. Centre-ville, Quebec, H3C 3J7, Montréal, Canada.
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MeSH Terms
Form Perception / physiology*
Perceptual Masking / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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