Document Detail

Coordinate transformations in object recognition.
MedLine Citation:
PMID:  17073527     Owner:  NLM     Status:  MEDLINE    
A basic problem of visual perception is how human beings recognize objects after spatial transformations. Three central classes of findings have to be accounted for: (a) Recognition performance varies systematically with orientation, size, and position; (b) recognition latencies are sequentially additive, suggesting analogue transformation processes; and (c) orientation and size congruency effects indicate that recognition involves the adjustment of a reference frame. All 3 classes of findings can be explained by a transformational framework of recognition: Recognition is achieved by an analogue transformation of a perceptual coordinate system that aligns memory and input representations. Coordinate transformations can be implemented neurocomputationally by gain (amplitude) modulation and may be regarded as a general processing principle of the visual cortex.
Markus Graf
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Psychological bulletin     Volume:  132     ISSN:  0033-2909     ISO Abbreviation:  Psychol Bull     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-10-31     Completed Date:  2007-01-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376473     Medline TA:  Psychol Bull     Country:  United States    
Other Details:
Languages:  eng     Pagination:  920-45     Citation Subset:  IM    
Copyright Information:
(c) 2006 APA, All Rights Reserved.
Max Planck Institute for Biological Cybernetics, Cognitive and Computational Psychophysics, Tübingen, Germany.
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MeSH Terms
Discrimination Learning / physiology*
Memory, Short-Term / physiology*
Models, Psychological
Neuropsychological Tests
Orientation / physiology*
Pattern Recognition, Visual / physiology*
Problem Solving / physiology
Reaction Time
Space Perception / physiology
Task Performance and Analysis

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

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