It has been shown that in deaf people, cortical reorganisation occurs and can accelerate age-related cognitive decline. Therefore, even though a number of Cochlear Implantation Reference Centres are setting up tests to detect cognitive disorders, these remain global and not very specific to deafness. Similarly, auditory rehabilitation could make cognitive decline reversible and bring about major changes in the cognitive functioning of patients which will be decisive for the effectiveness of speech therapy and the effectiveness of implantation. Indeed, it has been shown that, in the deaf postlingual patient, less neuronal activity in the auditory cortex and a reallocation of the cortical regions dedicated to auditory processing to visual tasks took place. This could subsequently influence the outcome of the cochlear implant. The aim of this study is therefore to evaluate the effectiveness of targeted speech therapy aimed at cognitive reorganisation on post-implant gain.

Inclusion Criteria:

• Men or Women ≥ 18 years of age coming for consultation at the implementation centre.
• Subjects who can read and write French.
• Patients who are candidates for cochlear implantation and who have not had any contraindication to the operation following the pre-implant assessment.
• Ability to sign free and informed consent.
• Subjects with a smartphone or laptop that allows access to the application

Exclusion Criteria:

- Physical and cultural factors that may interfere with testing.