Document Detail


Subordinate-level categorization relies on high spatial frequencies to a greater degree than basic-level categorization.
MedLine Citation:
PMID:  15971697     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In two experiments, category verification of images of common objects at subordinate, basic, and superordinate levels was performed after low-pass spatial filtering, high-pass spatial filtering, 50% phase randomization, or no image manipulation. Both experiments demonstrated the same pattern of results: Low-pass filtering selectively impaired subordinate-level category verification, while having little to no effect on basic-level category verification. Subordinate categorization consequently relies to a greater degree on high spatial frequencies of images. This vulnerability of subordinate-level processing was specific to a lack of high spatial frequency information, as opposed to other visual information, since neither high-pass filtering nor the addition of phase noise produced a comparable reduction in performance. These results are consistent with the notion that object recognition at basic levels relies on the general shapes of objects, whereas recognition at subordinate levels relies on finer visual details.
Authors:
Charles A Collin; Patricia A McMullen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception & psychophysics     Volume:  67     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-06-23     Completed Date:  2005-08-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  354-64     Citation Subset:  IM    
Affiliation:
Dalhousie University, Halifax, Nova Scotia, Canada. ccollin@uottawa.ca
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MeSH Terms
Descriptor/Qualifier:
Adult
Humans
Pattern Recognition, Visual*
Reaction Time
Space Perception*
Visual Perception*

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


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