Roberto Cabeza1,2, Maxi Becker2, Simon W Davis3,4. 1. Center for Cognitive Neuroscience, Duke University, Durham, NC 27708; cabeza@duke.edu. 2. Department of Psychology, Humboldt-University Berlin, 12489 Berlin, Germany. 3. Center for Cognitive Neuroscience, Duke University, Durham, NC 27708. 4. Department of Neurology, Duke University School of Medicine, Durham, NC 27708.