Document Detail

BOLD repetition decreases in object-responsive ventral visual areas depend on spatial attention.
MedLine Citation:
PMID:  15056686     Owner:  NLM     Status:  MEDLINE    
Functional imaging studies of priming-related repetition phenomena have become widely used to study neural object representation. Although blood oxygenation level-dependent (BOLD) repetition decreases can sometimes be observed without awareness of repetition, any role for spatial attention in BOLD repetition effects remains largely unknown. We used fMRI in 13 healthy subjects to test whether BOLD repetition decreases for repeated objects in ventral visual cortices depend on allocation of spatial attention to the prime. Subjects performed a size-judgment task on a probe object that had been attended or ignored in a preceding prime display of 2 lateralized objects. Reaction times showed faster responses when the probe was the same object as the attended prime, independent of the view tested (identical vs. mirror image). No behavioral effect was evident from unattended primes. BOLD repetition decreases for attended primes were found in lateral occipital and fusiform regions bilaterally, which generalized across identical and mirror-image repeats. No repetition decreases were observed for ignored primes. Our results suggest a critical role for attention in achieving visual representations of objects that lead to both BOLD signal decreases and behavioral priming on repeated presentation.
E Eger; R N A Henson; J Driver; R J Dolan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-03-31
Journal Detail:
Title:  Journal of neurophysiology     Volume:  92     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-07-27     Completed Date:  2004-09-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1241-7     Citation Subset:  IM    
Institute of Cognitive Neuroscience, 17 Queen Square, London WC1N 3AR, UK.
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MeSH Terms
Attention / physiology*
Brain Mapping*
Functional Laterality
Magnetic Resonance Imaging*
Oxygen / blood*
Photic Stimulation
Reaction Time
Size Perception / physiology
Space Perception / physiology*
Visual Cortex / blood supply*
Reg. No./Substance:

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

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