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Published Online September 18, 2003
Science DOI: 10.1126/science.1087839

Reports

Submitted on June 10, 2003
Accepted on July 15, 2003

Flexible Retinotopy: Motion-Dependent Position Coding in the Visual Cortex

David Whitney 1*, Herbert C. Goltz 2, Christopher G. Thomas 1, Joseph S. Gati 2, Ravi S. Menon 2, Melvyn A. Goodale 1

1 The Department of Psychology, The University of Western Ontario, London, Ontario N6A 5C2, Canada.
2 The Robarts Research Institute, London, Ontario N6A 5K8, Canada.

* To whom correspondence should be addressed. E-mail: dvw{at}uwo.ca.

Although the visual cortex is organized retinotopically, it is not clear whether the cortical representation of position necessarily reflects perceived position. Using functional magnetic resonance imaging (fMRI), we show that the retinotopic representation of a stationary object in the cortex was systematically shifted when visual motion was present in the scene. Whereas the object could appear shifted in the direction of the visual motion, the representation of the object in the visual cortex was always shifted in the opposite direction. The results show that the representation of position in the primary visual cortex, as revealed by fMRI, can be dissociated from perceived location.


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