fMRI mapping of a morphed continuum of 3D shapes within inferior temporal cortex

Tootell, Roger B H, Devaney, Kathryn, Young, Jeremy, Postelnicu, Gheorghe, Rajimehr, Reza and Ungerleider, Leslie G (2008) fMRI mapping of a morphed continuum of 3D shapes within inferior temporal cortex. Proceedings of the National Academy of Sciences, 105 (9). pp. 3605-3609. ISSN 1091-6490

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Here, we mapped fMRI responses to incrementally changing shapes along a continuous 3D morph, ranging from a head (“face”) to a house (“place”). The response to each shape was mapped independently by using single-stimulus imaging, and stimulus shapes were equated for lower-level visual cues. We measured activity in 2-mm samples across human inferior temporal cortex from the fusiform face area (FFA) (apparently selective for faces) to the parahippocampal place area (PPA) (apparently selective for places), testing for (i) incremental changes in the topography of FFA and PPA (predicted by the continuous-mapping model) or (ii) little or no response to the intermediate morphed shapes (predicted by the category model). Neither result occurred; instead, we found approximately linearly graded changes in the response amplitudes to graded-shape changes, without changes in topography—similar to visual responses in different lower-tier cortical areas.

Item Type: Article
Schools and Departments: School of Psychology > Psychology
Subjects: Q Science > QP Physiology > QP0351 Neurophysiology and neuropsychology
Depositing User: Jeremy Young
Date Deposited: 26 Oct 2012 14:25
Last Modified: 13 Mar 2017 12:28

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