**2. Materials and Methods**

Twenty-one patients were included in this prospective double-blind and crossover study. Inclusion criteria in this study were the following: adult patients with bilateral profound hearing loss, unilateral or bilateral cochlear implants with at least one year of experience, Digisonic CI and Saphyr 2 sound processor (Oticon Medical) in their monaural or binaural versions, and a dissyllabic word discrimination score (WDS) >20% with CI alone.

Among the 48 patients corresponding to these criteria in our center, we excluded 21 (44%) who did not wish to participate, 6 (13%) who had moved from our region and were lost to follow-up, and 1 who had poor speech recognition (WDS with CI alone: 14%). Twenty-one patients were included: five had a unilateral Digisonic DX10® (bearing 15 electrodes); t wore a unilateral and one a bilateral Digisonic SP® (20 electrodes); and three were rehabilitated by a binaural Digisonic® CI (12 electrodes on each side).

The protocol was reviewed and approved by the institutional ethical committee (CCP grand Est III). All patients were clearly informed and provided their oral and written consent for this study.
