The principal aim of this study is to evaluate the cortical developement of perceptual skills and executive functions over time, in children with cochlear implants aged 10-24 months and 3-7 years compared with normally hearing subjects (NHS). To do this, the investigator will use functional Near InfraRed Spectroscopy (fNIRS) during 4 tasks that engage the childs perceptual and cognitive skills over a period of 18 months. The performance scores obtained by each participants as well as the cortical activity will be analysed and decrypted.
10-24 months old children will be included.
All participants have to be affiliated to the social health security system and parental consent is obligatory.
All congenitally deaf patients will have a severe to profound hearing loss and about to be fitted with a cochlear implant.
Normally hearing counterparts shall have normal hearing as evidenced by acoustical otoemissions (AOE) in both ears.
Exclusion criteria include psycho-neurological diseases, other sensorineural or motor deficiency, familial bilingualism, medications affecting vigilance and child whose both parents benefit from a legal protection measure