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
Crossover
ABFnoS then ABFS (Cochlear implant)
DeviceCochlear implant with tonotopy-based fitting without synchronization with the contralateral hearing-aid then with synchronization with the contralateral hearing-aid
ABFS then ABFnoS (Cochlear implant)
DeviceCochlear implant with tonotopy-based fitting with synchronization with the contralateral hearing-aid then without synchronization with the contralateral hearing-aid
Accuracy of sound localization
The accuracy of sound localization will be achieved with a sound localization test in the horizontal plane with 7 loudspeakers (HP) spaced 30° apart and arranged in a ½ circle from -90° to +90° at 1m around the patient.
Accuracy of sound localization
The accuracy of sound localization will be achieved with a sound localization test in the horizontal plane with 7 loudspeakers (HP) spaced 30° apart and arranged in a ½ circle from -90° to +90° at 1m around the patient.
Bias of sound localization
The bias of sound localization will be achieved with a sound localization test in the horizontal plane with 7 loudspeakers (HP) spaced 30° apart and arranged in a ½ circle from -90° to +90° at 1m around the patient.
Bias of sound localization
The bias of sound localization will be achieved with a sound localization test in the horizontal plane with 7 loudspeakers (HP) spaced 30° apart and arranged in a ½ circle from -90° to +90° at 1m around the patient.
Speech recognition in noise
The speech recognition in noise is evaluated with the French-language VRB (vocale rapide dans le bruit) test \[Leclerc et al., Eur Ann Otorhinolaryngol Head Neck Dis . 2018 Oct;135(5):315-319.\]. It is a sentence test with target words. The speech level is at 65 dB sound pressure level (SPL) and the signal-to-noise ratio varies from 18 dB to -3 dB by 3 dB step.
Speech recognition in noise
The speech recognition in noise is evaluated with the French-language VRB (vocale rapide dans le bruit) test \[Leclerc et al., Eur Ann Otorhinolaryngol Head Neck Dis . 2018 Oct;135(5):315-319.\]. It is a sentence test with target words. The speech level is at 65 dB SPL and the signal-to-noise ratio varies from 18 dB to -3 dB by 3 dB step.
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