Where and When to Pay Attention: The Neural Systems for Directing Attention to Spatial Locations and to Time Intervals as Revealed by Both PET and fMRI

J.T.C. was funded by the Medical Research Council during the acquisition of these data and is now funded by The Wellcome Trust. The experiments were partially supported by a project grant to A.C.N. by The Wellcome Trust. We thank Professors Dick Passingham and Chris Frith for invaluable discussion and comments, and Dr. Christian Buechel for advice on analysis of fMRI data.

Correspondence should be addressed to Drs. J.T. Coull or A.C. Nobre, Functional Imaging Laboratory, Wellcome Department of Cognitive Neurology, Institute of Neurology, 12 Queen Square, London WC1N 3BG, UK.