1. P. Tallal, S. L. Miller, G. Bedi, G. Byma, Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ 07102, USA.
2. X. Wang, S. S. Nagarajan, C. Schreiner, W. M. Jenkins, M. M. Merzenich, W. M. Keck Center for Integrative Neurosciences and Coleman Laboratory, University of California, San Francisco, CA 94143-0732, USA.