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Anterior regions of monkey parietal cortex process visual 3D shape

Lookup NU author(s): Dr Olivier Joly

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Abstract

The intraparietal cortex is involved in the control of visually guided actions, like reach-to-grasp movements, which require extracting the 3D shape and position of objects from 2D retinal images. Using fMRI in behaving monkeys, we investigated the role of the intraparietal cortex in processing stereoscopic information for recovering the depth structure and the position in depth of objects. We found that while several areas (CIP, LIP, and AIP on the lateral bank; PIP and MIP on the medial bank) are activated by stereoscopic stimuli, AIP and an adjoining portion of LIP are sensitive only to depth structure. Furthermore, only these two regions are sensitive to both the depth structure and the 2D shape of small objects. These results indicate that extracting 3D spatial information from stereo involves several intraparietal areas, among which AIP and anterior LIP are more specifically engaged in extracting the 3D shape of objects.

Publication metadata

Author(s): Durand JB, Nelissen K, Joly O, Wardak C, Todd JT, Norman JF, Janssen P, Vanduffel W, Orban GA

Publication type: Article

Publication status: Published

Journal: Neuron

Year: 2007

Volume: 55

Issue: 3

Pages: 493-505

ISSN (print): 0896-6273

ISSN (electronic): 1097-4199

Publisher: Cell Press

URL: http://dx.doi.org/10.1016/j.neuron.2007.06.040

DOI: 10.1016/j.neuron.2007.06.040

PubMed id: 17678860

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