1. Beckman Institute for Advanced Science and Technology University of Illinois at Urbana‐Champaign Urbana Illinois USA
2. Department of Psychology University of Michigan Ann Arbor Michigan USA
3. Department of Psychology Northeastern University Boston Massachusetts USA
4. Centre for Human Brain Health and School of Psychology University of Birmingham Birmingham UK
5. Centre for Neuroscience, University of Alberta, Alta., Canada; now at Laboratory of Behavioral Neuroscience, Brain Imaging and Behavior Section National Institute on Aging Baltimore Maryland USA
6. Department of Bioengineering University of Illinois at Urbana‐Champaign Urbana Illinois USA
7. Neuroscience Program University of Illinois at Urbana‐Champaign Urbana Illinois USA
8. Department of Psychology University of Illinois at Urbana‐Champaign Champaign Illinois USA