Drawing together contributions from a broad selection of internationally recognized experts in the field, this book aims to provide an up-to-date summary of research concerned with speech perception and production in profoundly hearing-impaired children and adults. Following introductory chapters provided by Professor Gunnar Fant of the Department of Speech Communication and Music Acoustics in Stockholm, and Professor Harry Levitt of the City University of New York, the main body of the book is divided into four sections covering tactile aids, cochlear implants, speech perception and speech production.