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Dynamic Shape Integration in Extrastriate Cortex

Yin, Carol and Shimojo, Shinsuke and Moore, Cassandra and Engel, Stephen A (2002) Dynamic Shape Integration in Extrastriate Cortex. Current Biology, 12 (16). pp. 1379-1385. ISSN 0960-9822. doi:10.1016/S0960-9822(02)01071-0.

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Background: In anorthoscopic viewing conditions, observers can perceive a moving object through a narrow slit even when only portions of its contour are visible at any time. We used fMRI to examine the contribution of early and later visual cortical areas to dynamic shape integration. Observers' success at integrating the shape of the slit-viewed object was manipulated by varying the degree to which the stimulus was dynamically distorted. Line drawings of common objects were either moderately distorted, strongly distorted, or shown undistorted. Phenomenologically, increasing the stimulus distortion made both object shape and motion more difficult to perceive. Results: We found that bilateral cortical activity in portions of the ventral occipital cortex, corresponding to known object areas within the lateral occipital complex (LOC), was inversely correlated with the degree of stimulus distortion. We found that activity in left MT+, the human cortical area specialized for motion, showed a similar pattern as the ventral occipital region. The LOC also showed greater activity to a fully visible moving object than to the undistorted slit-viewed object. Area MT+, however, showed more equivalent activity to both the slit-viewed and fully visible moving objects. Conclusions: In early retinotopic cortex, the distorted and undistorted stimuli elicited the same amount of activity. Higher visual areas, however, were correlated with the percept of the coherent object, and this correlation suggests that the shape integration is mediated by later visual cortical areas. Motion information from the dorsal stream may project to the LOC to produce the shape percept.

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Additional Information:© 2002 Cell Press. Received 7 December 2001, Revised 20 May 2002, Accepted 1 July 2002, Available online 25 August 2002. Published: August 20, 2002. The authors wish to thank Jody Culham for comments and suggestions on an earlier draft of this paper.
Issue or Number:16
Record Number:CaltechAUTHORS:20170408-144041845
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75989
Deposited By: 1Science Import
Deposited On:26 Apr 2017 23:44
Last Modified:15 Nov 2021 16:56

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