OBJECTIVE To monitor changes in cochlear function during cochlear implantation using electrocochleography (ECoG) and to correlate changes to postoperative hearing preservation. METHODS ECoG responses to acoustic stimuli of 250, 500, and 1000 Hz were recorded during cochlear implantation. The recording electrode was placed on the promontory and stabilized to fix the position during cochlear im...

This paper presents a case study on the linguistic use of fundamental frequency (F0), amplitude, and duration by a post-lingually deafened adult speaker with a cochlear implant. Although multi-channel cochlear implants do not have good resolution of F0, it has been reported anecdotally that the intonation of cochlear implant users sounds “fine” in conversations. This observation implies that po...

Deprivation from normal sensory input has been shown to alter tonotopic organization of the human auditory cortex. In this context, cochlear implant subjects provide an interesting model in that profound deafness is made partially reversible by the cochlear implant. In restoring afferent activity, cochlear implantation may also reverse some of the central changes related to deafness. The purpos...

BACKGROUND cochlear implant is a rather processing electronic device in terms of its benefits, as it provides the deaf child with the appropriation of incidental oral language. AIM to evaluate the hearing performance of the first 60 children with pre-lingual sensorineural hearing loss who were implanted at the Audiologic Research Centre of the Hospital de Reabilitação de Anomalias Craniofacia...

The purpose of this study was to investigate if applying hearing aid directional microphones and noise reduction algorithms as preprocessors to cochlear implant speech processors can enhance speech understanding and listening preference of cochlear implant users. Hearing aid preprocessed speech materials were recorded when KEMAR was wearing a pair of nine-channel digital hearing aids and sittin...

The benefit of cochlear implantation crucially depends on the ability of the brain to learn to classify neural activity evoked by the cochlear implant. Brain plasticity is a complex property with massive developmental changes after birth. The present paper reviews the experimental work on auditory plasticity and focuses on the plasticity required for adaptation to cochlear implant stimulation. ...

Fifteen patients fit with a cochlear implant in one ear and a hearing aid in the other ear were presented with tests of speech and melody recognition and voice discrimination under conditions of electric (E) stimulation, acoustic (A) stimulation and combined electric and acoustic stimulation (EAS). When acoustic information was added to electrically stimulated information performance increased ...

Previous work has demonstrated that normal-hearing individuals use fine-grained phonetic variation, such as formant movement and duration, when recognizing English vowels. The present study investigated whether these cues are used by adult postlingually deafened cochlear implant users, and normal-hearing individuals listening to noise-vocoder simulations of cochlear implant processing. In Exper...

El ectrically Evoked Compound Action Potential is a measure of synchronous cochlear nerve fibers activity elicited by electrical stimulation of the cochlear implant. The electrophysiological nerve responses may contribute to explain the variability in individual performance of cochlear implant recipients. Aim: To compare speech perception tests' performances of cochlear implant users according ...