Sensorineural Hearing Loss, Bilateral
Conditions
Keywords
cochlear implant stimulation strategy sound coding strategy
Brief summary
Main objective: Show the superiority of Fine Structure (FS4) strategy compared to Continuous Interleaved Sampling (HDCIS) strategy on the qualitative preference for the listening of musical pieces. Secondary objectives * Show the superiority of FS4 strategy compared to the HDCIS strategy on the perception of musical elements (contour test). * Analyze the link between the results of musical perception tests and the subjective preference of musical listening. * Show the non inferiority of FS4 strategy compared to the HDCIS strategy on the perception of speech elements. * Analyze the link between the results of musical perception tests and the results of the perception of speech elements. * Analyze the qualitative multidimensional perception with HDCIS and FS4
Detailed description
Introduction: At present, most people with modern cochlear implant systems can understand speech using the device alone, at least under favorable listening conditions. In recent years, research has increasing focussed on how implant users perceive sounds other than speech. In particular, music perception is of interest. A review of the literature on musical perception with traditional implants, coding only the temporal envelope \[McDermott 2004\], revealed the following elements: * On average, implant users perceive the rhythm approximately as well as listeners with normal hearing * With technically sophisticated multi-channel sound processors, melody recognition, especially without rhythmic or verbal cues, is poor. * The perception of timbre, especially the sounds of musical instruments, is generally unsatisfactory. * Implant users tend to rate the quality of musical sounds as less enjoyable than listeners with normal hearing And studies show that the fine structure of sound is the main vector of information for music and the location of sounds. \[Smith et al. 2002\] It therefore seems necessary to focus on the contribution of the coding of the fine temporal structure of sound to the cochlear implant. Main objective: Show the superiority of FS4 strategy compared to HDCIS strategy on the qualitative preference for the listening of musical pieces. Secondary objectives: * Show the superiority of FS4 strategy compared to the HDCIS strategy on the perception of musical elements (contour test). * Analyze the link between the results of musical perception tests and the subjective preference of musical listening. * Show the non inferiority of FS4 strategy compared to the HDCIS strategy on the perception of speech elements. * Analyze the link between the results of musical perception tests and the results of the perception of speech elements. * Analyze the qualitative multidimensional perception with HDCIS and FS4 Plan of the study: It is a prospective open monocentric randomized crossover study: measures will be done on the patient at 15 days and 30 days post-activation.
Interventions
DEVICEFineHearing strategy or HDCIS strategy
Cochlear implant with FineHearing strategy or HDCIS strategy
Sponsors
MED-EL Elektromedizinische Geräte GesmbH
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
DOUBLE (Subject, Investigator)
Masking description
Double blind study: the patient and the investigator don't know the strategy
Intervention model description
two arms A and B: Arm A: patient's fitting with strategy FS4 --\> 15 days use --\> tests and patient's fitting with strategy HDCIS --\> 15 days use --\> tests Arm B: patient's fitting with strategy HDCIS --\> 15 days use --\> tests and patient's fitting with strategy FS4 --\> 15 days use --\> tests
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Adult patient (≥ 18 years old) speaking French * Patient who fulfils the criteria for cochlear implantation
Exclusion criteria
\- Retro-cochlear pathology: auditory neuropathy, vestibular schwannoma
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Qualitative measure of music | at 15 days post-activation | The Gabrielsson scale (1988) is used to evaluate perceived sound quality as a multidimensional phenomenon, that is composed of a number of separate perceptual dimensions. Eight perceptual dimensions are evaluated: clarity, fullness, brightness vs dullness, hardness/sharpness vs softness, spaciousness, nearness, extraneous sounds, loudness. Visual analog scales (VAS) are used for each dimension and the patient has to score the dimension on a 10 cm VAS (between 0 to 10). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Speech recognition in quiet | at 15 days post-activation | The speech recognition in quiet is evaluated with syllabic list of 40 phonemes. The patient has to recognize 21 syllables. The phonemes are scored: each good answer is scored 1 yielding a total between 0 and 1 (or 0% and 100%). |
| Differential frequency threshold | at 15 days post-activation | This test aimed to determine the smallest perceptible difference in F0 between two stimuli for various baseline values of F0. An adaptive procedure is used. |
| Melodic contour test | at 15 days post-activation | The test stimuli of the melodic contour test (Galvin et al. 2007) are melodic contours composed of 5 notes of equal duration whose frequencies corresponded to musical intervals. Nine distinct musical patterns have to be identified by the patient. Each good answer is scored 1 yielding a total between 0 and 1 (or 0% and 100%). |
Countries
France
Outcome results
None listed