This study will take place in the CHU de La Timone in Marseilles in the ENT children department and is at the heart of a cooperation with Dr Emmanuel Bigand team in Dijon (LEAD CNRS, UMR 5022 à Dijon). The cochlear implant children department in Marseilles gathers a group of more than 70 implanted children aged from 4 to 10 that is in adequacy with the parameters for the method to evaluate.