Dissociation and convergence of the dorsal and ventral visual working memory streams in the human prefrontal cortex

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Visual information is largely processed through two pathways in the primate brain: an object pathway from the primary visual cortex to the temporal cortex (ventral stream) and a spatial pathway to the parietal cortex (dorsal stream). Whether and to what extent dissociation exists in the human prefrontal cortex (PFC) has long been debated. We examined anatomical connections from functionally defined areas in the temporal and parietal cortices to the PFC, using noninvasive functional and diffusion-weighted magnetic resonance imaging. The right inferior frontal gyrus (IFG) received converging input from both streams, while the right superior frontal gyrus received input only from the dorsal stream. Interstream functional connectivity to the IFG was dynamically recruited only when both object and spatial information were processed. These results suggest that the human PFC receives dissociated and converging visual pathways, and that the right IFG region serves as an integrator of the two types of information. (C) 2012 Elsevier Inc. All rights reserved.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2013-01
Language
English
Article Type
Article
Keywords

KeyWords Plus:WHITE-MATTER TRACTOGRAPHY; POSITRON-EMISSION-TOMOGRAPHY; TENSOR IMAGING TRACTOGRAPHY

Citation

NEUROIMAGE, v.65, pp.488 - 498

ISSN
1053-8119
DOI
10.1016/j.neuroimage.2012.10.002
URI
http://hdl.handle.net/10203/104435
Appears in Collection
EE-Journal Papers(저널논문)
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