- Professor J R Hodges, MRC Cambridge Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge CB2 2EF, UK. Telephone 0044 1223 355294; fax 0044 1223 359062.
- Received June 6, 1997
- Revised May 21, 1998
- Accepted June 15, 1998
- First published December 1, 1998.
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