Inclusion Criteria:  Person having given his or her non-opposition Implanted post lingual profound deafness and one functional contralateral ear (normal hearing or mild to severe hearing loss with hearing aids) Have more than 6 months of experience with cochlear implants Daily use of their two hearing aids for more than 6 hours a day  Exclusion Criteria:  person subject to a legal protection measure (guardianship, tutorship) person subject to a measure of judicial control pregnant, parturient or breastfeeding woman adult unable to express consent minor