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History
- Received October 15, 1999
- Revision received November 30, 1999
- Accepted December 2, 1999
- First published March 15, 2000.
- Version of record published March 15, 2000.
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Copyright © 2000 Society for Neuroscience
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Author contributions
Disclosures
- Received October 15, 1999.
- Revision received November 30, 1999.
- Accepted December 2, 1999.
We thank D. Halliday, J. R. Rosenberg, and D. Buckwell for statistical advice and the use of programs used in the analysis of data, A. Lozano and P. Winkler for the grid implantation and surgical treatment of the patients at TW and GRH, and E. Sincini for technical assistance.
Correspondence should be addressed to Dr. P. Brown, Medical Research Council Human Movement and Balance Unit, Institute of Neurology, Queen Square, WCIN 3BG London, UK. E-mail: p.brown{at}ion.ac.uk.






