Document Detail

Attention-modulated activity in visual cortex--more than a simple 'spotlight'.
MedLine Citation:
PMID:  18222709     Owner:  NLM     Status:  MEDLINE    
We assessed modulation of retinotopic visual cortex representing peripheral regions of the visual field while subjects engaged in a central attention task. The onset of an attention capturing central letter stream attenuated activity in representations of the peripheral locations. When these locations were empty, the observed reduction was the same whether subjects passively viewed or actively attended the letter stream. For locations containing distracting letters, however, an additional attenuation was observed during the active task. In a second experiment we found that representations of target incompatible peripheral letters were suppressed relative to a control task, whereas at the same time representations of compatible peripheral letters were relatively enhanced. The fMRI results are complemented by behavioral data demonstrating prolonged responses to probes presented at suppressed locations. In sum, our study suggests that activity modulation across the visual field representation not only reflects an attentional spotlight effect but is additionally shaped by the nature of sensory input at unattended locations as well as its relation to task demands.
Notger G Müller; Daniel Ebeling
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-12-15
Journal Detail:
Title:  NeuroImage     Volume:  40     ISSN:  1053-8119     ISO Abbreviation:  Neuroimage     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-03-17     Completed Date:  2008-07-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9215515     Medline TA:  Neuroimage     Country:  United States    
Other Details:
Languages:  eng     Pagination:  818-27     Citation Subset:  IM    
Cognitive Neurology Unit and Brain Imaging Center, Clinic for Neurology, Johann Wolfgang Goethe-University, Schleusenweg 2-16, 60528 Frankfurt am Main, Germany.
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MeSH Terms
Attention / physiology*
Magnetic Resonance Imaging*
Visual Cortex / physiology*
Visual Fields / physiology*

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

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