1. Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology, and Osaka University, Suita-shi, Osaka 565-0871, Japan
2. Graduate School of Frontier Biosciences, Osaka University, Suita-shi, Osaka 565-0871, Japan
3. Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN 47405, USA
4. Department of Psychology, Stanford University, Stanford, CA 94305, USA
5. Max Planck Institute for Biological Cybernetics, 72072 Tübingen, Germany
6. Bio-Imaging Laboratory, Department of Biomedical Sciences, University of Antwerp, Wilrijk 2610, Belgium
7. Laboratory of Neural Systems, The Rockefeller University, New York, NY 10065, USA
8. Neurophysiology Imaging Facility, National Institute of Mental Health, National Institute of Neurological Disorders and Stroke, National Eye Institute, National Institutes of Health, Bethesda, MD 20814, USA