Document Detail


Pooling and segmenting motion signals.
MedLine Citation:
PMID:  19027034     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Humans are extremely sensitive to visual motion, largely because local motion signals can be integrated over a large spatial region. On the other hand, summation is often not advantageous, for example when segmenting a moving stimulus against a stationary or oppositely moving background. In this study we show that the spatial extent of motion integration is not compulsory, but is subject to voluntary attentional control. Measurements of motion coherence sensitivity with summation and search paradigms showed that human observers can combine motion signals from cued regions or patches in an optimal manner, even when the regions are quite distinct and remote from each other. Further measurements of contrast sensitivity reinforce previous studies showing that motion integration is preceded by a local analysis akin to contrast thresholding (or intrinsic uncertainty). The results were well modelled by two standard signal-detection-theory models.
Authors:
David C Burr; Stefano Baldassi; M Concetta Morrone; Preeti Verghese
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-12-16
Journal Detail:
Title:  Vision research     Volume:  49     ISSN:  1878-5646     ISO Abbreviation:  Vision Res.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-15     Completed Date:  2009-12-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1065-72     Citation Subset:  IM    
Affiliation:
Dipartimento di Psicologia, Università Degli Studi di Firenze, Florence, Italy.
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MeSH Terms
Descriptor/Qualifier:
Attention / physiology*
Contrast Sensitivity / physiology
Cues
Discrimination (Psychology) / physiology
Humans
Motion Perception / physiology*
Pattern Recognition, Visual / physiology
Photic Stimulation / methods
Psychophysics
Sensory Thresholds / physiology

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


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