Document Detail

The perceived direction of textured gratings and their motion aftereffects.
MedLine Citation:
PMID:  8734539     Owner:  NLM     Status:  MEDLINE    
The stimuli in these experiments are square-wave luminance gratings with an array of small random dots covering the high-luminance regions. Owing to the texture, the direction of these gratings, when seen through a circular aperture, is disambiguated because the visual system is provided with an unambiguous motion energy. Thus, the direction of textured gratings can be varied independently of grating orientation. When subjects are required to judge the direction of textured gratings moving obliquely relative to their orientation, they can do so accurately (experiment 1). This is of interest because most studies of one-dimensional motion perception have involved (textureless) luminance-defined since-wave or square-wave gratings, and the perceived direction of these gratings is constrained by the aperture problem to be orthogonal to their orientation. Thus, direction and orientation have often been confounded. Interestingly, when subjects are required to judge the direction of an obliquely moving textured grating during a period of adaptation and then the direction of the motion aftereffect (MAE) immediately following adaptation (experiments 2 and 3), these directions are not directly opposite each other. MAE directions were always more orthogonal to the orientation of the adapting grating than the corresponding direction judgments during adaptation (by as much as 25 degrees). These results are not readily explained by conventional MAE models and possible accounts are considered.
D Alais; M J van der Smagt; F A Verstraten; W A van de Grind
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception     Volume:  24     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  1995  
Date Detail:
Created Date:  1996-11-07     Completed Date:  1996-11-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1383-96     Citation Subset:  IM; S    
Department of Psychology, School of Behavioural Sciences, Macquarie University, Sydney, NSW, Australia.
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MeSH Terms
Adaptation, Ocular*
Computer Simulation
Contrast Sensitivity
Luminescent Measurements
Motion Perception / physiology*
Photic Stimulation

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

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