Document Detail

The role of speed lines in subtle direction judgments.
MedLine Citation:
PMID:  15781078     Owner:  NLM     Status:  MEDLINE    
Stimuli moving in slightly different directions trace trajectories that differ slightly in orientation. These different 'speed lines', in principle, could generate responses in orientation mechanisms, and such responses could determine how well we judge subtle direction differences. Alternatively, the ability to judge subtle direction differences could be determined by direction mechanisms rather than by orientation mechanisms. To distinguish between these possibilities we exploited the fact that opposite directions of motion share an orientation: Across trials, participants judged a constant orientation difference between trajectories having either the same or opposite motion signs. The probabilities of the motion signs were also manipulated. When the probabilities were consistent with those typically used to assess fine direction discrimination, direction mechanisms set the limit on performance. In other conditions where orientation mechanisms could have set the limit on performance, responses were neither more precise nor faster than when performance was limited by direction mechanisms.
Nestor Matthews; Jason Allen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  45     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-03-22     Completed Date:  2005-07-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1629-40     Citation Subset:  IM    
Department of Psychology, Denison University, Granville, OH 43023, USA.
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MeSH Terms
Differential Threshold / physiology
Discrimination (Psychology) / physiology
Discrimination Learning / physiology
Judgment / physiology
Motion Perception / physiology*
Orientation / physiology
Pattern Recognition, Visual / physiology
Photic Stimulation / methods
Sensory Thresholds / physiology
Space Perception / physiology
Vision, Binocular / physiology

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

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