The effects of cochlear implants on speech production in postlingually acquired deafness

Acoustic analyses were made of speech recordings from 75 deafened subjects before and after cochlear irnplantion. and 51 controls, using the ASSESS system. Pre-implant speech was abnormal in timing. intensity range. pitch height and change. frication, and spectral balance. Implantation reduced some anomalies. left some unchanged, and aggravated others. Many effects were sex-related.