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Cerebral Cortex Advance Access published online on July 3, 2006
Cerebral Cortex, doi:10.1093/cercor/bhl027
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Article

Beyond Retinotopic Mapping: The Spatial Representation of Objects in the Human Lateral Occipital Complex

Ayelet McKyton 1 and Ehud Zohary 2 *

1 Neurobiology Department, Life Science Institute, Hebrew University, Jerusalem 91904, Israel
2 Neurobiology Department, Life Science Institute, Hebrew University, Jerusalem 91904, Israel; Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem 91904, Israel

* To whom correspondence should be addressed.
Ehud Zohary, E-mail: udiz{at}lobster.ls.huji.ac.il


  Abstract

The spatial representation in the human ventral object-related areas (i.e., the lateral occipital complex [LOC]) is currently unknown. It seems plausible, however, that it would diverge from the strict retinotopic mapping (characteristic of V1) to a more invariant coordinate frame, thereby allowing for reliable object recognition in the face of eye, head, or body movement. To study this, we compared the fMRI activation in LOC when object displacement was limited to either the retina or the screen by manipulating eye position and object locations. We found clear adaptation in LOC when the object's screen position was fixed, regardless of the object's retinal position. Furthermore, we found significantly greater activation in LOC in the hemisphere contralateral to the object's screen position, although the visual task was constructed in a way that the objects were present equally often on each of the 2 retinal hemifields. Together, these results indicate that a sizeable fraction of the neurons in LOC may have head-based receptive fields. Such an extraretinal representation may be useful for maintenance of object coherence across saccadic eye movements, which are an integral part of natural vision.

Keywords: coordinate transformation; egocentric; fMRI; object recognition; vision.
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