Document Detail


The quantitative nature of a visual task differentiates between ventral and dorsal stream.
MedLine Citation:
PMID:  12126505     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of the present positron emission tomography (PET) study was to investigate how visual processing in dorsal and ventral streams depends on the quantitative nature of the task. In the same-different task, participants identified the presence of an orientation difference between two gratings, presented centrally in succession. In the quantification task, participants estimated the magnitude of the difference and compared it to a fixed standard. Detection of dimming of the fixation point was used as a control task. Visual input, motor responses, and performance were equated across tasks. Subtracting same-different from quantification yielded significant activation in the left superior parietal lobule and left ventral premotor cortex, consistent with results obtained in number-processing tasks. The reverse subtraction yielded activation in the right inferior temporal gyrus, in agreement with earlier results. These results demonstrate that a single attribute can be processed either in the ventral or dorsal stream, depending on the cognitive operations required by the tasks.
Authors:
Wim Fias; Patrick Dupont; Bert Reynvoet; Guy A Orban
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of cognitive neuroscience     Volume:  14     ISSN:  0898-929X     ISO Abbreviation:  J Cogn Neurosci     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-07-19     Completed Date:  2002-09-03     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8910747     Medline TA:  J Cogn Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  646-58     Citation Subset:  IM    
Affiliation:
Ghent University.
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MeSH Terms
Descriptor/Qualifier:
Adult
Behavior / physiology
Brain Mapping
Female
Humans
Male
Mathematics
Mental Processes / physiology
Motor Cortex / physiology
Parietal Lobe / physiology
Temporal Lobe / physiology
Tomography, Emission-Computed
Visual Pathways / physiology*,  radionuclide imaging
Visual Perception / physiology*

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


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