Document Detail


Stimulus-determined discrimination mechanisms for color search.
MedLine Citation:
PMID:  10497425     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Visual attention can be goal driven, stimulus driven, or a combination of the two. Here we report evidence for an unexpectedly stimulus-driven component of visual search for a target defined by color. Observers demonstrated a surprisingly cost-free ability to incorporate multiple classifiers in search for a target of one color from among distractors of other colors. A target color was presented among distractors that could change from trial to trial (intermixed presentation) or that remained constant across all trials in a block (blocked presentation). For blocked presentation, a single search classifier (a mechanism that segregates the target from distractors in color space) could be adopted, whereas for intermixed presentation different classifiers had to be used when the distractor colors changed. The benefit of blocked presentation was very small, suggesting that the appropriate classifier was determined very quickly in trials for which the classifier changed. The results suggest that the stimulus-driven activation of an appropriate stimulus classifier can be very efficient.
Authors:
E S Olds; W B Cowan; P Jolicoeur
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception & psychophysics     Volume:  61     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1999 Aug 
Date Detail:
Created Date:  1999-11-02     Completed Date:  1999-11-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1038-45     Citation Subset:  IM    
Affiliation:
University of Waterloo, Ontario, Canada. esolds@cgl.uwaterloo.ca
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MeSH Terms
Descriptor/Qualifier:
Adult
Attention*
Color Perception*
Depth Perception
Discrimination Learning*
Female
Humans
Male
Pattern Recognition, Visual*
Psychophysics
Reaction Time

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


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