Document Detail


Perceptual expectation evokes category-selective cortical activity.
MedLine Citation:
PMID:  19759124     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Selective visual attention directed to a location (even in the absence of a stimulus) increases activity in the corresponding regions of visual cortex and enhances the speed and accuracy of target perception. We further explored top-down influences on perceptual representations by manipulating observers' expectations about the category of an upcoming target. Observers viewed a display in which an object (either a face or a house) gradually emerged from a state of phase-scrambled noise; a cue established expectation about the object category. Observers were faster to categorize faces (gender discrimination) or houses (structural discrimination) when the category of the partially scrambled object matched their expectation. Functional magnetic resonance imaging revealed that this expectation was associated with anticipatory increases in category-specific visual cortical activity, even in the absence of object- or category-specific visual information. Expecting a face evoked increased activity in face-selective cortical regions in the fusiform gyrus and superior temporal sulcus. Conversely, expecting a house increased activity in parahippocampal gyrus. These results suggest that visual anticipation facilitates subsequent perception by recruiting, in advance, the same cortical mechanisms as those involved in perception.
Authors:
Michael Esterman; Steven Yantis
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2009-09-16
Journal Detail:
Title:  Cerebral cortex (New York, N.Y. : 1991)     Volume:  20     ISSN:  1460-2199     ISO Abbreviation:  Cereb. Cortex     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-04-12     Completed Date:  2010-06-28     Revised Date:  2014-09-13    
Medline Journal Info:
Nlm Unique ID:  9110718     Medline TA:  Cereb Cortex     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1245-53     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Attention / physiology*
Brain Mapping*
Cues*
Discrimination (Psychology)*
Female
Humans
Image Processing, Computer-Assisted / methods
Magnetic Resonance Imaging / methods
Male
Noise
Oxygen / blood
Pattern Recognition, Visual / physiology*
Photic Stimulation / methods
Reaction Time / physiology
Time Factors
Visual Cortex / blood supply,  physiology*
Visual Pathways / blood supply,  physiology
Grant Support
ID/Acronym/Agency:
R01 DA013165/DA/NIDA NIH HHS; R01 DA013165-10/DA/NIDA NIH HHS; R01-DA13165/DA/NIDA NIH HHS
Chemical
Reg. No./Substance:
S88TT14065/Oxygen
Comments/Corrections

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


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