Document Detail


Salience from feature contrast: additivity across dimensions.
MedLine Citation:
PMID:  10788635     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Test targets ('singletons') that displayed orientation, motion, luminance, or color contrast, or pairwise combinations of these, were presented in line texture arrays, and their saliences were quantified in comparison to reference targets at defined luminance levels. In general, saliency effects in different stimulus dimensions did add, but did not add linearly. That is, targets with feature contrast in two dimensions were generally more salient than targets with only one of these properties, but often less salient than predicted from the sum of the individual saliency components. Salience variations within a dimension were compared with and without a second saliency effect added. The resulting gain reduction in the combined stimulus conditions was interpreted to reflect the amount of overlap between the respective saliency mechanisms. Combinations of orientation and color contrast produced the strongest gain reduction (about 90% for color in orientation) thus indicating the strongest overlap of underlying saliency mechanisms. Combinations of orientation and motion contrast revealed about 50% overlap, slightly smaller rates were found for combinations of color and motion. All combinations with luminance contrast (orientation and luminance, motion and luminance) produced only little gain reduction (<30%) thus indicating a higher degree of independence between the underlying saliency mechanisms than for other stimulus dimensions.
Authors:
H Nothdurft
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Vision research     Volume:  40     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2000  
Date Detail:
Created Date:  2000-08-04     Completed Date:  2000-08-04     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1183-201     Citation Subset:  IM    
Affiliation:
Visual Perception Laboratory (VPL), Göttingen, Germany. hnothdu@gwdg.de
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Color Perception / physiology
Contrast Sensitivity / physiology*
Female
Humans
Lighting
Male
Motion Perception / physiology
Pattern Recognition, Visual / physiology*
Photic Stimulation / methods
Psychophysics

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


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