Main objective:
Compare speech recognition in noise with tonotopic setting (FS4T) and with tonotopic fitting modified by evolutionary algorithm (EAFS4T) in adult patients implanted for 6 months or more with a MED-EL cochlear implant with FS4T.
Secondary objectives:
Comparison of FS4T and EAFS4T settings
* for speech recognition in quiet * for subjective auditory spatial perception * for subjective auditory and musical 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
EAFS4T: modification with evolutionary algorithm of tonotopic-based fitting
Other interventionComparison of FS4T and EAFS4T
Speech recognition in noise
HINT-5 min test. Noise level: 60 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 EAFS4T and with FS4T.
Speech recognition in quiet
One list of 10 disyllabic words (Fournier lists) at 65 dB SPL. The participant has to repeat the word emitted. Result: score on 10. Test with EAFS4T and with FS4T
Subjective auditory spatial perception
SSQi15 questionnaire (" 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 to 10 ranging from "not at all" to "yes perfectly". 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 EAFS4T fitting) and with EAFS4T (6 weeks after EAFS4T fitting)
Subjective assessment of auditory perception
Assessment of sound quality in silence and in noise with 4 statements. Likert scale from 1 to 5. Score on 20. Likert scale with FS4T (at EAFS4T fitting) and with EAFS4T (6 weeks after EAFS4T fitting)
Subjective assessment of musical perception
Six questions from the Munich Music Self-Questionnaire \[Stark et al. 2003\]. Questionnaire with FS4T (at EAFS4T fitting) and with EAFS4T (6 weeks after EAFS4T fitting)
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