Defining the Neural Mechanisms of Probabilistic Reversal Learning Using Event-Related Functional Magnetic Resonance Imaging

This work was supported by a Wellcome Trust Programme grant (T.W.R.) and completed within a Medical Research Council Company-operative Group in Brain, Behavior, and Neuropsychiatry. R.C. holds the C. D. Marsden Parkinson's Disease Society Studentship. We thank Paul Fletcher and Matthew Brett for helpful discussion and Victoria Liversidge, Ruth Bisbrown-Chippendale, and Tim Donovan from the Wolfson Brain Imaging Centre (Cambridge, UK) for radiographic assistance with this study.

Correspondence should be addressed to Trevor W. Robbins, Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK.E-mailtwr2{at}cus.cam.ac.uk.