Cochlear Prosthesis Implantation
Conditions
Keywords
Cochlear implants users, microphone, virtual reality, spatial hearing perception
Brief summary
The construction of our auditory space requires several prerequisites, including localization abilities in 3D (azimuth, elevation and distance). These abilities rely on the proper development and functionality of the auditory system to extract various acoustic cues from our environment. Extraction and analysis of these auditory cues are based on the synchronous use of ears, called binaurality. Other natural behaviours are useful to precisely determine the location of a sound source: visual information and head movements. The slightest anatomical-functional change (e.g. unilateral hearing loss, malformation of the pinna) can disturb spatial hearing abilities. Many patients with hearing loss are fitted with a hearing aid (HA) or a cochlear implant (CI) to ensure the best speech understanding. However, this auditory rehabilitation remains insufficient to restore a good perception of spatial hearing. One of the key point to improve sound localization seems to be microphone positioning on hearing aids. Several questions remain on the optimal microphone positioning.
Interventions
DEVICEModification of active microphone positioning
Patient will pass the experimental tests described above with 3 different active microphone positions : * on the cochlear implant processor; * on the antenna * in front of the external ear canal Patient will pass the tests 1 week after each microphone position change, so that they can get used to the new position in their everyday life.
BEHAVIORALSPHERE protocol
Patient's 3D localization in noise will be assessed thnks to a 3D localization system called SPHERE based on virtual reality. Data from spatial hearing perception will be recorded in three-dimensional space (azimuth, elevation, and depth). First, the pointing error will be computed separately for azimuth, elevation, and depth, in terms of constant error (absolute and signed) and variable error. Then, these separate errors will be combined into a cumulative error 3d-D (the 3d-D value), hence summarizing all three space dimensions, and taking into account absolute and variable error in one measure.
BEHAVIORALFrench Matrix Test
This test assesses the intelligibility threshold defined as the noise level (in decibels) for which the subject can repeat 50% of the words heard (in dichotic listening), resulting in an Speech Recognition Threshold (SRT) value
BEHAVIORALQuality of life questionnaire
The Speech, Spatial and Qualities of Hearing Scale short-form with 15 items (SSQ15) questionnaire is performed in order to evaluate auditory abilities of patients in different daily life situations.
BEHAVIORALLikert scale
This subjective evaluation will be added to evaluate difficulties and self-confidence felt by participants during the SPHERE protocol and the French Matrix Test.
Sponsors
Hospices Civils de Lyon
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* Age 18 to 75 inclusive * Regular follow-up in the Ear Nose and Throat department of the Edouard Herriot hospital in Lyon * Post-lingual deafness * Fitted with two Advanced Bionics (AB) cochlear implants (Naïda Q70 or Naïda Q90 processor) Or fitted with one AB cochlear implant and a contralateral hearing aid * Fitted with the latest implant for more than 1 year * Normal or corrected vision * Able to understand experimental instructions * Affiliated with a social security scheme
Exclusion criteria
* Oculomotor disorder * Bilateral vestibular areflexia * Adult subject to a legal protection measure (guardianship, curatorship)
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from baseline in 3d-D value at day 7 | Baseline and day 7 | We will compare 3d-D values obtained with baseline microphone position (at day 0) and 1 week after the first microphone positioning change. Baseline microphone position is defined as the usual position at inclusion and might vary from one patient to another. Combined with change in SRT values and SSQ15 scores, these results will allow us to assess the effect of microphones positioning on spatial auditory performance. |
| Change from baseline in 3d-D value at day 14 | Baseline and day 14 | We will compare 3d-D values obtained with baseline microphone position (at day 0) and 1 week after the second microphone positioning change. Baseline microphone position is defined as the usual position at inclusion and might vary from one patient to another. Combined with change in SRT values and SSQ15 scores, these results will allow us to assess the effect of microphones positioning on spatial auditory performance. |
| Change from baseline in SRT value at day 7 | Baseline and day 7 | We will compare SRT values obtained with baseline microphone position (at day 0) and 1 week after the first microphone positioning change. Baseline microphone position is defined as the usual position at inclusion and might vary from one patient to another. Combined with change in 3d-D values and SSQ15 scores, these results will allow us to assess the effect of microphones positioning on spatial auditory performance. |
| Change from baseline in SRT value at day 14 | Baseline and day 14 | We will compare SRT values obtained with baseline microphone position (at day 0) and 1 week after the second microphone positioning change. Baseline microphone position is defined as the usual position at inclusion and might vary from one patient to another. Combined with change in 3d-D values and SSQ15 scores, these results will allow us to assess the effect of microphones positioning on spatial auditory performance. |
| Change from baseline in SSQ15 score at day 7 | Baseline and day 7 | We will compare SSQ15 scores obtained with baseline microphone position (at day 0) and 1 week after the first microphone positioning change. Baseline microphone position is defined as the usual position at inclusion and might vary from one patient to another. Combined with change in 3d-D values and SRT values, these results will allow us to assess the effect of microphones positioning on spatial auditory performance. |
| Change from baseline in SSQ15 score at day 14 | Baseline and day 14 | We will compare SSQ15 scores obtained with baseline microphone position (at day 0) and 1 week after the second microphone positioning change. Baseline microphone position is defined as the usual position at inclusion and might vary from one patient to another. Combined with change in 3d-D values and SRT values, these results will allow us to assess the effect of microphones positioning on spatial auditory performance. |
Countries
France
Outcome results
None listed