Bibliographical noteFunding Information:
We are grateful to Mark Cohen for his assistance with fMRI. We also thank John Mazziotta, the UCLA Brain Mapping Medical Organization, the Ahmanson Foundation, the Pierson-Lovelace Foundation, the Tamkin Foundation and the Jennifer Jones-Simon Foundation for their support.
This research was supported by an MRC Programme Grant G9537855 and an MRC Co-operative in Brain, Behaviour and Neuropsychiatry. J.H. was supported by Trinity College, Cambridge under an MD/Ph.D. program. We thank Caroline Morrison for technical assistance.