Fan-Gang Zeng1, Barbara Canlon2. 1. Center for Hearing Research, 110 Medical Science E, University of California, Irvine, CA 92697, USA. Electronic address: fzeng@uci.edu. 2. Department of Physiology and Pharmacology (FYFA), C3, Experimental Audiology, 171 77 Stockholm, Sweden. Electronic address: Barbara.Canlon@ki.se.