Restauration of the Auditory and Cognitive Functions in Cochlear Implanted Deaf Children in FNIRS

Functional neuroimaging examination by fNIRS at each follow-up visit for all children of both cohorts: this non-invasive imaging technique involves the installation of a cap carrying electrodes to collect brain activity on the surface of the scalp , during stimulation. It is very insensitive to movement and therefore represents a method particularly suitable for its use in children. In addition, this technique is compatible with the cochlear implant. It will be used during 6 tasks adapted to each cohort

Passive perceptual stimulation: For this passive task the child is on his parents' lap in front of a screen. He will see images, hear everyday noises and watch small videos. Duration 8-10 minutes.

Task A not B: the child will play with an adult who will hide an object under a cloth several times. The child will have to find the hidden object. Duration 10 minutes maximum

VSWMT task: the child will be on the parents' lap in front of a screen and will watch a monkey hiding bananas in the trees several times. Duration of 10 minutes maximum.

Perceptual Go-No-Go: This perceptual task consists in the discrimination of images (faces) and sounds (words) through 3 conditions (auditory, visual and visuo-auditory) presented independently of each other and lasts 15 to 20 minutes in total. It is presented by means of a computer

Verbal memory task :the child will be presented with 5 lists of 5 words which he will have to restore after a predefined delay of a few seconds. Its duration does not exceed 10 minutes.

The sensory room: the child will sit in the middle of a carpet and play with the adult. He will hear everyday noises and see light effects. Duration 8-10 minutes