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History
- Received August 27, 1998
- Revision received December 15, 1998
- Accepted December 21, 1998
- First published March 1, 1999.
- Version of record published March 1, 1999.
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Copyright © 1999 Society for Neuroscience
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Disclosures
- Received August 27, 1998.
- Revision received December 15, 1998.
- Accepted December 21, 1998.
This work was supported by funding from the National Institutes of Health. We thank T. Lam for assistance in figure preparation and Dr. M. Burchinal and E. Neebe for statistical consultation.
Correspondence should be addressed to Dr. Geoffrey Schoenbaum, Johns Hopkins University, Department of Psychology, 3400 North Charles Street, 25 Ames Hall, Baltimore, MD 21218.