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History
- Received November 17, 1999
- Revision received February 8, 2000
- Accepted February 11, 2000
- First published May 1, 2000.
- Version of record published May 1, 2000.
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Copyright © 2000 Society for Neuroscience
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Disclosures
- Received November 17, 1999.
- Revision received February 8, 2000.
- Accepted February 11, 2000.
This work was supported by the Wellcome Trust. B.C. is a Royal Society University Research Fellow. We thank Holly Bridge and Owen Thomas for their help in collecting the psychophysical data.
Correspondence should be addressed to Dr. Simon J.D. Prince, University Laboratory of Physiology, Parks Road, Oxford, OX1 3PT, UK. E-mail:simon.prince{at}physiol.ox.ac.uk.