1Departments of Neurology, Newcastle University Medical School, Framlington Place, Newcastle-upon-Tyne NE2 4HH
2Departments of Physiological Sciences, Newcastle University Medical School, Framlington Place, Newcastle-upon-Tyne NE2 4HH
3Wellcome Department of Cognitive Neurology, Institute of Neurology, London WCIN 3BG, UK
4McConnell Brain Imaging Centre, Montreal Neurological Institute, Montreal H3A 2B4
5Départment de Psychologie, Université de Montréal H3C 3J7, Canada
6Centre for the Neural Basis of Hearing, Physiology Department, University of Cambridge, Cambridge CB2 3EG, UK
7Corresponding Author: Timothy D. Griffiths and Address: Departments of Physiological Sciences, Newcastle University Medical School, Framlington Place, Newcastle-upon-Tyne NE2 4HH
Acknowledgements: We thank I.R. This collaboration was made possible by grants to T.D.G. from the Wellcome Trust (UK) and to I.P. from the Medical Research Council of Canada.
Received 5 January 2000; accepted 15 January 2000
