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History
- Received November 19, 2003
- Revision received January 27, 2005
- Accepted January 28, 2005
- First published March 30, 2005.
- Version of record published March 30, 2005.
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Copyright © 2005 Society for Neuroscience 0270-6474/05/253280-07.00/0
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Disclosures
- Received November 19, 2003.
- Revision received January 27, 2005.
- Accepted January 28, 2005.
This work was supported by National Institutes of Health-National Institute on Aging Grant 441587-HB-33589. We thank John Mazziotta, the University of California, Los Angeles Brain Mapping Medical Organization, the Ahmanson Foundation, the Pierson-Lovelace Foundation, the Tamkin Foundation, and the Jennifer Jones-Simon Foundation for their support. We also thank Mark Cohen for assistance with fMRI and Russell Poldrack and Dean Buonamano for helpful discussions.
Correspondence should be addressed to Barbara J. Knowlton, Department of Psychology, University of California, Los Angeles, Franz Hall, Los Angeles, CA 90095. E-mail: knowlton{at}psych.ucla.edu.
Copyright © 2005 Society for Neuroscience 0270-6474/05/253280-07$15.00/0