Document Detail

Cortical mechanisms of feature-based attentional control.
MedLine Citation:
PMID:  14615298     Owner:  NLM     Status:  MEDLINE    
A network of fronto-parietal cortical areas is known to be involved in the control of visual attention, but the representational scope and specific function of these areas remains unclear. Recent neuroimaging evidence has revealed the existence of both transient (attention-shift) and sustained (attention-maintenance) mechanisms of space-based and object-based attentional control. Here we investigate the neural mechanisms of feature-based attentional control in human cortex using rapid event-related functional magnetic resonance imaging (fMRI). Subjects viewed an aperture containing moving dots in which dot color and direction of motion changed once per second. At any given moment, observers attended to either motion or color. Two of six motion directions and two of six colors embedded in the stimulus stream cued subjects either to shift attention from the currently attended to the unattended feature or to maintain attention on the currently attended feature. Attentional modulation of the blood oxygenation level dependent (BOLD) fMRI signal was observed in early visual areas that are selective for motion and color. More importantly, both transient and sustained BOLD activity patterns were observed in different fronto-parietal cortical areas during shifts of attention. We suggest these differing temporal profiles reflect complementary roles in the control of attention to perceptual features.
Taosheng Liu; Scott D Slotnick; John T Serences; Steven Yantis
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cerebral cortex (New York, N.Y. : 1991)     Volume:  13     ISSN:  1047-3211     ISO Abbreviation:  Cereb. Cortex     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-11-17     Completed Date:  2004-01-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9110718     Medline TA:  Cereb Cortex     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1334-43     Citation Subset:  IM    
Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, USA.
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MeSH Terms
Action Potentials / physiology
Attention / physiology*
Brain Mapping / methods*
Eye Movements / physiology
Frontal Lobe / physiology*
Magnetic Resonance Imaging / methods*
Neurons / physiology*
Parietal Lobe / physiology*
Pattern Recognition, Visual / physiology
Visual Perception / physiology*
Grant Support

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