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The goal of this study is to take into account channel interaction in the cochlear implant (CI) fitting process. Designing a fast and accurate method of measurement would help to customize the fitting procedures to patients' specificities in order to maximize speech understanding in every day conditions especially in noise.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Cochlear implant users | Experimental | Adult cochlear implanted patients wearing an Oticon Medical/Neurelec device will have speech audiometry test in noise, psychophysical tuning curves in forward masking and Electrically-evoked Auditory Brainstem Response (EABR) measurement |
|
| Normal-hearing subjects | Active Comparator | Normal-hearing subjects will have speech audiometry test in noise, psychophysical tuning curves in forward masking, auditory canal examination and tonal audiometry |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| speech audiometry in noise | Other | Subjects will be asked to repeat lists of words played by speakers in a noisy environment generated by the same speakers. A percentage of correct recognition is calculated for each list. |
| Measure | Description | Time Frame |
|---|---|---|
| Percentage of syllable correctly recognized during speech audiometry test | Subjects will be asked to repeat lists of words played by speakers in a noisy environment generated by the same speakers. A percentage of correct recognition is calculated for each list. | At inclusion |
| Measure | Description | Time Frame |
|---|---|---|
| Sound masking threshold | Measurement of channel interaction by establishing psychophysical tuning curves in forward masking. Sounds of variable center frequency are used as a masker, and a tone with a fixed frequency at a fixed level is the target. What is tested here is the level of masker that just masks the target. | At inclusion |
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Inclusion Criteria:
Fluent in French
Able to understand written instructions
Under French public medical insurance
Normal-hearing subjects only:
Cochlear implant users only:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Eric TRUY, MD, PhD | Hospices Civils de Lyon | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| ENT and Cervico-Facial Surgery Department, Hôpital Edouard Herriot | Lyon | 69003 | France |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 33578696 | Result | Cucis PA, Berger-Vachon C, Thai-Van H, Hermann R, Gallego S, Truy E. Word Recognition and Frequency Selectivity in Cochlear Implant Simulation: Effect of Channel Interaction. J Clin Med. 2021 Feb 10;10(4):679. doi: 10.3390/jcm10040679. |
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| Psychophysical tuning curves in forward masking | Other | Sounds of variable center frequency are used as maskers, and a tone with a fixed frequency at a fixed level is the target. What is tested here is the level of masker that just masks the target. |
|
| Electrically-evoked Auditory Brainstem Response (EABR) | Other | Channel interaction assessment using eABRs (auditory nerve responses). The method consists of two measurements: 1) eABR measurements with stimulation by a single electrode of the cochlear implant at 70% of the dynamic range (four different electrodes are tested); 2) Measurement of a single eABR with stimulation from all four electrodes at 70% of the dynamic range. A comparison of the eABRs obtained by these two measurements, indicates the electrical and neural interactions between the electrodes. |
|
| Tonal audiometry | Other | Tonal audiometry will be performed with headphones |
|
| Auditory canal examination | Other | Otoscopic examination of external auditory canal and eardrum |
|
| Electrically-evoked Auditory Brainstem Response (eABR) |
Channel interaction assessment using eABRs (auditory nerve responses). The method consists of two measurements: 1) eABR measurements with stimulation by a single electrode of the cochlear implant at 70% of the dynamic range (four different electrodes are tested); 2) Measurement of a single eABR with stimulation from all four electrodes at 70% of the dynamic range. A comparison of the eABRs obtained by these two measurements, indicates the electrical and neural interactions between the electrodes. |
| Up to 12 months after inclusion |
| ID | Term |
|---|---|
| D009622 | Noise |
| ID | Term |
|---|---|
| D013016 | Sound |
| D011840 | Radiation, Nonionizing |
| D011827 | Radiation |
| D055585 | Physical Phenomena |
| D004777 | Environment |
| D055669 | Ecological and Environmental Phenomena |
| D001686 | Biological Phenomena |
| D004778 | Environment and Public Health |
| D004787 | Environmental Pollution |
| D011634 | Public Health |
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