Document Detail

Similar effects of feature-based attention on motion perception and pursuit eye movements at different levels of awareness.
MedLine Citation:
PMID:  22649238     Owner:  NLM     Status:  MEDLINE    
Feature-based attention enhances visual processing and improves perception, even for visual features that we are not aware of. Does feature-based attention also modulate motor behavior in response to visual information that does or does not reach awareness? Here we compare the effect of feature-based attention on motion perception and smooth-pursuit eye movements in response to moving dichoptic plaids--stimuli composed of two orthogonally drifting gratings, presented separately to each eye--in human observers. Monocular adaptation to one grating before the presentation of both gratings renders the adapted grating perceptually weaker than the unadapted grating and decreases the level of awareness. Feature-based attention was directed to either the adapted or the unadapted grating's motion direction or to both (neutral condition). We show that observers were better at detecting a speed change in the attended than the unattended motion direction, indicating that they had successfully attended to one grating. Speed change detection was also better when the change occurred in the unadapted than the adapted grating, indicating that the adapted grating was perceptually weaker. In neutral conditions, perception and pursuit in response to plaid motion were dissociated: While perception followed one grating's motion direction almost exclusively (component motion), the eyes tracked the average of both gratings (pattern motion). In attention conditions, perception and pursuit were shifted toward the attended component. These results suggest that attention affects perception and pursuit similarly even though only the former reflects awareness. The eyes can track an attended feature even if observers do not perceive it.
Miriam Spering; Marisa Carrasco
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  32     ISSN:  1529-2401     ISO Abbreviation:  J. Neurosci.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-31     Completed Date:  2012-08-06     Revised Date:  2013-06-24    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7594-601     Citation Subset:  IM    
Department of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, BC V5Z 1L8, Canada.
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MeSH Terms
Analysis of Variance
Attention / physiology*
Awareness / physiology*
Eye Movements / physiology*
Motion Perception / physiology*
Photic Stimulation
Reaction Time
Space Perception
Young Adult
Grant Support
R01 EY016200/EY/NEI NIH HHS; R01-EY016200/EY/NEI NIH HHS

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