Exacerbation of Pain by Anxiety Is Associated with Activity in a Hippocampal Network

We thank Michael Fanselow, Gary Van Hoesen, Stuart Derbyshire, and Predrag Petrovic for helpful comments. A.P. holds a Junior Research Fellowship at Merton College (Oxford, UK), and I.T. and the Oxford Centre for Functional Magnetic Resonance Imaging of the Brain are funded by the Medical Research Council (UK).

Correspondence should be addressed to Alexander Ploghaus, Department of Neuroradiology, Massachusetts General Hospital and Harvard Medical School, 13th Street, Building 149, Charlestown, MA 02129. E-mail: ploghaus{at}nmr.mgh.harvard.edu.