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Fine-scale spatial organization of face- and limb-selective regions in human high-level visual cortex

Author: Kevin Sean Weiner; Kalanit Grill-Spector; Anthony David Wagner; Brian A Wandell; Stanford University. Department of Psychology.
Publisher: 2011.
Dissertation: Thesis (Ph. D.)--Stanford University, 2011.
Edition/Format:   Thesis/dissertation : Document : Thesis/dissertation : eBook   Computer File : English
Database:WorldCat
Summary:
Neurophysiology and optical imaging studies in monkeys and functional magnetic resonance imaging (fMRI) studies in both monkeys and humans have localized clustered neural responses in high-level visual cortex selective for images of biologically relevant categories such as faces and limbs. Implementing higher resolution (1.5mm voxels) fMRI scanning methods than prior studies (3-5mm voxels), the results reported in  Read more...
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Details

Material Type: Document, Thesis/dissertation, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Kevin Sean Weiner; Kalanit Grill-Spector; Anthony David Wagner; Brian A Wandell; Stanford University. Department of Psychology.
OCLC Number: 745374762
Notes: Submitted to the Department of Psychology.
Description: 1 online resource.
Responsibility: Kevin S. Weiner.

Abstract:

Neurophysiology and optical imaging studies in monkeys and functional magnetic resonance imaging (fMRI) studies in both monkeys and humans have localized clustered neural responses in high-level visual cortex selective for images of biologically relevant categories such as faces and limbs. Implementing higher resolution (1.5mm voxels) fMRI scanning methods than prior studies (3-5mm voxels), the results reported in this dissertation illustrate a topographic organization of face- and limb-selective regions in adjacent and alternating clusters in both ventral temporal and lateral occipitotemporal cortices. Region of interest analyses in a series of experiments indicate distinct category and position sensitivities within these clusters and multivoxel pattern analyses indicate different amounts of information in highly-, weakly-, and non-selective voxels for these categories. These results mediate the debate between modular and distributed theories of high-level visual cortex, as well as support a novel, sparsely-distributed organization including both locally clustered and distributed elements for face and limb representations. These results also reveal two new basic organization principles of high-level visual cortex where there is both a consistency in the anatomical location of functional regions, as well as a preserved spatial relationship among functional regions. Employing these two principles enables the first framework for consistent parcellation of high-level visual regions outside of retinotopic cortex. Importantly, this framework can also be applied to other sensory and nonsensory cortical systems.

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