1. Senior Fellow, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
2. University of Southern California, Los Angeles, CA 90089, USA
3. University of Michigan, Ann Arbor, MI 48109, USA Santa Fe Institute, Santa Fe, NM 87501, USA
4. McGovern Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5. The Neurosciences Institute, San Diego, CA 92121, USA
6. Laboratory of Neuropsychology, National Institute of Mental Health, Bethesda, MD 20892, USA
7. †This Letter was prepared as part of the co-author's official duties as a U.S. government employee. The views expressed in the Letter do not necessarily represent the views of the NIMH, NIH, DHHS, or the U.S. government.
8. IBM Almaden Research Center, San Jose, CA 95120-6099, USA
9. School of Medicine, Washington University, St. Louis, MO 63110, USA
10. Yale University Medical School, New Haven, CT 06510, USA
11. Department of Psychiatry, University of Wisconsin, Madison, WI 53719-1179, USA