Sensorineural Hearing Loss
Conditions
Keywords
hearing loss, cochlear implant, psychoacoustic, charge integration efficiency
Brief summary
The cochlear implant provides good auditory performance despite high inter-individual variability, but performance in noise remains limited. Modification of the coding strategies could improve these performances. A better characterization of the remaining neuronal population by looking for the charge integration efficiency (which depends on the duration and the amplitude of the electrical pulse) would allow an optimization of the settings by adapting either the duration or the amplitude of the pulse according to the quality of the remaining neuronal population.
Detailed description
The cochlear implant provides good auditory performance despite high inter-individual variability, but performance in noise remains limited. Modification of the coding strategies could improve these performances. Currently, the intensity perceived by the patient is coded by the duration and the amplitude of the electrical impulse but companies have different approaches and fix one of the two parameters for the setting of the processors. A better characterization of the remaining neuronal population by looking for the charge integration efficiency (which depends on the duration and the amplitude of the electrical pulse) would allow an optimization of the settings by adapting either the duration or the amplitude of the pulse according to the quality of the remaining neuronal population.
Interventions
OTHERCochlear implant (Oticon) stimulation parameter optimization
The pulse amplitude and/or the pulse phase duration will be optimize to improve the intensity resolution of the cochlear implant which may benefit speech perception
Sponsors
University Hospital, Tours
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* post-lingually deaf adults with at least one year of cochlear implant experience * unilateral and bilateral cochlear implant recipients * Oticon device with Neuro Zti array * Patient affiliated to french social security * Consent signed
Exclusion criteria
* Patients under court protection, guardianship or curatorship
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Calculate the charge integration efficiency along the electrodes | 4 hours | Charge integration efficiency will be determined for each electrode by noting the minimum and maximum loudness perceived by the patient as function of pulse phase duration and amplitude |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Questionnaire between Intensity discrimination and charge integration efficiency | 4 hours | 3 electrodes that span the range of charge integration efficiency values will be selected as test electrodes. Three intensities will be presented to the patient through the implant and it will be asked to the patient to determine which intensity is higher than the others. |
Contacts
Primary ContactDavid Bakhos, MD, PhD
Backup ContactElodie MOUSSET, MSc
Outcome results
None listed