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Differences in processing of 3-D shape from multiple cues in monkey cortex revealed by fMRI

MPG-Autoren
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Sereno,  ME
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Augath,  M
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Logotethis,  NK
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Zitation

Sereno, M., Augath, M., & Logotethis, N. (2005). Differences in processing of 3-D shape from multiple cues in monkey cortex revealed by fMRI. Talk presented at 35th Annual Meeting of the Society for Neuroscience (Neuroscience 2005). Washington, DC, USA.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-D3D9-A
Zusammenfassung
Previous work using fMRI in anesthetized monkeys to investigate the representation of 3-D objects and surfaces suggests a set of candidate areas in monkey cortex for cue-invariant 3-D shape processing (Sereno et al., Neuron, 2002). The present study examines activation overlap for 3-D surface shape defined with 3 different cues by directly comparing activation for the same 3-D shapes in the same monkey subjects. Stimuli consisted of a set of 3-D surfaces defined by dynamic (random dots with motion parallax) and static (shading and contour) shape cues. Each shape defined by a particular cue was paired with a control stimulus consisting of a scrambled or disrupted cue gradient to diminish or abolish an impression of depth. Activation from a comparison of intact to control stimuli revealed regions of common activation (e.g., in superior temporal and intra-parietal sulci) for shape defined by the 3 different cues. However, significant differences between the dynamic and static cues emerged. The extent and strength of activation was greater in area MT for dynamic compared to static cues; whereas the opposite was true in area V4. In addition, while there was significant overlap across the cues in regions of the STS anterior to area MT (FST and mid-anterior STS), in each of these regions there was a greater number of voxels active for shape-from-motion stimuli in the fundus vs. the more lateral aspect of the ventral bank. In turn, the lateral aspect of the ventral bank had a greater number of voxels active for shape-from-shading and -contour compared to shape-from-motion stimuli. Between the regions activated primarily by dynamic or static cues there was a region of convergence activated by all the cues.