Dissociation and Convergence of the Dorsal and Ventral Visual Streams in the Human Prefrontal Cortex
Identifieur interne : 002497 ( Main/Merge ); précédent : 002496; suivant : 002498Dissociation and Convergence of the Dorsal and Ventral Visual Streams in the Human Prefrontal Cortex
Auteurs : Emi Takahashi [États-Unis] ; Kenichi Ohki [États-Unis, Japon] ; Dae-Shik Kim [États-Unis, Corée du Sud]Source :
- NeuroImage [ 1053-8119 ] ; 2012.
Abstract
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.
Url:
DOI: 10.1016/j.neuroimage.2012.10.002
PubMed: 23063444
PubMed Central: 4384683
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