Main objective:
Compare speech recognition in noise with tonotopic fitting (FS4T) and with conventional non-tonotopic fitting (FS4noT) in adult patients implanted for 6 months with a MED-EL cochlear implant with FS4noT strategy.
Secondary objectives:
Comparison of FS4noT and FS4T settings
* for speech recognition in quiet * for subjective auditory spatial perception
Adult patient (>= 18 years old) speaking French
Patient who fulfils the criteria for cochlear implantation
retro-cochlear pathology: auditory neuropathy, vestibular schwannoma
Single group
Tonotopic cochlear implant fitting FS4T
Other interventionComparison of FS4T and FS4noT
Speech recognition in noise
Framatrix test. Speech and noise in front the participant (at 1m). Noise level: 65 dB SPL. Speech level: adaptive with the answers of the participant. Result: speech-to-noise ratio (speech reception threshold, SRT50) for 50% of intelligibility in noise. Test with FS4T and with FS4noT
Speech recognition in quiet
Two lists of 10 disyllabic words (Fournier lists) at 65 dB SPL. The participant has to repeat the word emitted. Result: score on 20. Test with FS4T and with FS4noT.
Subjective auditory spatial perception
Questionnaire SSQi15 (" Speech, Spatial, and Qualities of hearing scale ", SSQ). The questionnaire consists of 15 questions describing various real-world hearing situations. The subject answers each question with a score on a visual analogue scale graduated from 0 (worse) to 10 (better) ranging from "not at all" (0) to "yes perfectly" (10). The result obtained is composed of * a total average score equal to the sum of the scores of all the questions divided by the total number of questions. * 3 average sub-scores describing 3 subscales: Speech hearing with 5 questions Spatial hearing with 5 questions Quality of hearing with 5 questions. Questionnaire with FS4T (at FS4T fitting) and with FS4noT (6 weeks after FS4T fitting)
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