[1] MASSACHUSETTS EYE & EAR INFIRM, EATON PEABODY LAB AUDITORY PHYSIOL, BOSTON, MA 02114 USA
[2] MASSACHUSETTS GEN HOSP, NEUROL SERV, BOSTON, MA 02114 USA
[3] MIT, ELECTR RES LAB, CAMBRIDGE, MA 02139 USA
[4] HARVARD UNIV, SCH MED, DEPT OTOLARYNGOL, BOSTON, MA 02115 USA
[5] HARVARD UNIV, SCH MED, DEPT PHYSIOL, BOSTON, MA 02115 USA