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The Journal of Neuroscience, May 14, 2008, 28(20):5218-5228; doi:10.1523/JNEUROSCI.5105-07.2008

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Behavioral/Systems/Cognitive
Neural Ensemble Decoding Reveals a Correlate of Viewer- to Object-Centered Spatial Transformation in Monkey Parietal Cortex

David A. Crowe,1,3 Bruno B. Averbeck,4 and Matthew V. Chafee1,2,3

1Department of Neuroscience, University of Minnesota Medical School, and 2Center for Cognitive Sciences, University of Minnesota, Minneapolis, Minnesota 55455, 3Brain Sciences Center, Veterans Affairs Medical Center, Minneapolis, Minnesota 55417, and 4Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, London WC1N 3BG, United Kingdom

Correspondence should be addressed to David A. Crowe, Brain Sciences Center, Veterans Affairs Medical Center, 1 Veterans Drive, Minneapolis, MN 55417. Email: crowe009{at}umn.edu

The parietal cortex contains representations of space in multiple coordinate systems including retina-, head-, body-, and world-based systems. Previously, we found that when monkeys are required to perform spatial computations on objects, many neurons in parietal area 7a represent position in an object-centered coordinate system as well. Because visual information enters the brain in a retina-centered reference frame, generation of an object-centered reference requires the brain to perform computation on the visual input. We provide evidence that area 7a contains a correlate of that computation. Specifically, area 7a contains neurons that code information in retina- and object-centered coordinate systems. The information in retina-centered coordinates emerges first, followed by the information in object-centered coordinates. We found that the strength and accuracy of these representations is correlated across trials. Finally, we found that retina-centered information could be used to predict subsequent object-centered signals, but not vice versa. These results are consistent with the hypothesis that either area 7a, or an area that precedes area 7a in the visual processing hierarchy, is performing the retina- to object-centered transformation.

Key words: parietal; object centered; neural ensemble; area 7a; time-resolved decoding; object based

Received Aug. 10, 2007; revised March 14, 2008; accepted April 7, 2008.

Correspondence should be addressed to David A. Crowe, Brain Sciences Center, Veterans Affairs Medical Center, 1 Veterans Drive, Minneapolis, MN 55417. Email: crowe009{at}umn.edu




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Transformations in 7a: challenging 'vision for action' or bridging the dorsal and ventral streams?
Lee H de-Wit, et al.
J. Neurosci. Online, 18 Jul 2008 [Full text]

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