Main objective:
For a bimodal fitting (hearing aid (HA) + cochlear implant (CI)): Comparison of a tonotopy based fitting strategy with synchronization between HA and CI (ABFS) to a tonotopy based fitting strategy without synchronization (ABFnoS) for the accuracy of sound localization.
Secondary objectives:
Comparison of ABFS to ABFnoS for the bias of sound localization. Comparison of ABFS to ABFnoS for speech perception in noise. Comparison of ABFS to ABFnoS for the auditory skills experienced by the subject.
Adult patient (>= 18 years old) speaking French
Patient who fulfils the criteria for cochlear implantation
Total hearing loss for less than 5 years
retro-cochlear pathology: auditory neuropathy, vestibular schwannoma
patient with residual hearing < 70 dB hearing level (HL) at 250 Hz and 500 Hz and < 80 dB HL at 1000 Hz on the contralateral ear