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Cerebral Cortex Advance Access originally published online on December 5, 2007
Cerebral Cortex 2008 18(8):1779-1787; doi:10.1093/cercor/bhm203
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Neural Correlates of Visually Induced Self-Motion Illusion in Depth

Gyula Kovács1,2, Markus Raabe1 and Mark W. Greenlee1

1 Institute of Psychology, University of Regensburg, 93053 Regensburg, Germany, 2 Department of Cognitive Science, Budapest University of Technology and Economics, H-1111 Budapest, Hungary

Address correspondence to Prof. M. W. Greenlee, Institute of Psychology, University of Regensburg, Universitätsstr. 31, D-93053 Regensburg, Germany. Email: mark.greenlee{at}psychologie.uni-regensburg.de.

Optic-flow fields can induce the conscious illusion of self-motion in a stationary observer. Here we used functional magnetic resonance imaging to reveal the differential processing of self- and object-motion in the human brain. Subjects were presented a constantly expanding optic-flow stimulus, composed of disparate red–blue dots, viewed through red–blue glasses to generate a vivid percept of three-dimensional motion. We compared the activity obtained during periods of illusory self-motion with periods of object-motion percept. We found that the right MT+, precuneus, as well as areas located bilaterally along the dorsal part of the intraparietal sulcus and along the left posterior intraparietal sulcus were more active during self-motion perception than during object-motion. Additional signal increases were located in the depth of the left superior frontal sulcus, over the ventral part of the left anterior cingulate, in the depth of the right central sulcus and in the caudate nucleus/putamen. We found no significant deactivations associated with self-motion perception. Our results suggest that the illusory percept of self-motion is correlated with the activation of a network of areas, ranging from motion-specific areas to regions involved in visuo-vestibular integration, visual imagery, decision making, and introspection.

Key Words: 3D • fMRI • linear vection • object-motion • optic-flow • self-motion


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