Positron Emission Tomography Imaging of Brain Reorganisation of the Central Auditory Cortex in Asymetrical Profound Deaf Patient With a Cochlear Implantation.

Study Overview
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Brief Summary
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Our main objective is to study how the extent of reorganization of the central auditory system is related to the binaural integration in cochlear implanted subjects with asymmetric hearing loss. Subjects with asymmetric hearing loss treated with a cochlear implant and a control group of normal hearing subjects will perform two tests for binaural integration (speech recognition in noise and spatial localization) and two tasks of non-linguistic sounds perception.

Detailed Description
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Cochlear implantation is the most efficient method to restore hearing in deaf patients. However, about 2/3 of patients have some residual hearing and these patients usually combine two types of auditory information (electrical and acoustical). It is important to know how the brain is processing during two distinct stimulations and how it is related to the auditory level of performance. Patients and controls will undergo a positron emission tomography scan brain imaging session during a simplified voice/non-voice discrimination task. For each tasks and brain imaging sessions, patients will be stimulated either with the non-implanted ear (acoustical stimulation), the cochlear implant (electrical stimulation) and using both modalities in a binaural condition.

Official Title
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Positron Emission Tomography Imaging of Brain Reorganisation of the Central Auditory Cortex in Asymetrical Profound Deaf Patient With a Cochlear Implantation

Conditions
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Profound Hearing Impairment

Intervention / Treatment
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* Other: Positron emission tomography scan


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: cochlear implantation>3 months signature of informed consent affiliation to social service. Exclusion Criteria: associated neurological disorder protected subjects epilepsy episodes psychotropic medication pregnancy

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Subjects with asymmetric hearing loss treated with a cochlear implant and a control group of normal hearing subjects
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Asymmetric hearing loss<br>Asymmetric hearing loss treated with a cochlear implant will undergo positron emission tomography scan. | Other: Positron emission tomography scan<br>* Binaural hearing assessments: speech recognition in noise and sound source localization Voice perception assessment: voice/non-voice discrimination task, free categorization task Positron emission tomography examinations under ecological auditory stimuli (voice/non-voice discrimination task)<br>|
| Other: Normal hearing subjects<br>Normal hearing subjects will undergo positron emission tomography scan. | Other: Positron emission tomography scan<br>* Binaural hearing assessments: speech recognition in noise and sound source localization Voice perception assessment: voice/non-voice discrimination task, free categorization task Positron emission tomography examinations under ecological auditory stimuli (voice/non-voice discrimination task)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Differences in auditory brain activation between cochlear implanted asymmetric hearing loss subjects and normal hearing subjects in the binaural condition. | Prior to the imaging session, patients performed two human voice interpretation tests. link between temporal activations and performances obtained in binaural integration tasks in the patient group. | Day 1 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| differences in auditory brain activation. | Auditory brain activation when the better ear is acoustically stimulated in asymmetric hearing loss subjects and when one ear is stimulated in normal hearing subjects. | Week 3 - Week 5 | 
| Performance level and the pattern of brain activation. | Acoustical or electrical stimulation in asymmetric hearing loss cochlear implanted subjects. | Week 3 - Week 5 | 
| the asymmetry in auditory brain activation for asymmetric hearing loss cochlear implanted subjects. | Electrical and acoustical stimulation will be used. | Week 3 - Week 5 | 
| link between binaural hearing performances and auditory brain activation in the binaural condition. | For the group of cochlear implanted subjects with asymmetric hearing loss. | Week 3 - Week 5 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Auditory plasticity, Tinnitus, Cochlear implantation, Deafness, Auditory cortex