Deafness and Cognition in Middle-aged Adults

This study is examining the relationship between significant hearing loss and cognitive function in middle-aged adults. Researchers want to understand whether deafness contributes to cognitive decline, and how cochlear implants or other hearing interventions may help. **You may be eligible if...** - You are between 45 and 64 years old - You have severe to profound bilateral hearing loss (in both ears) that developed after learning to speak, and hearing aids do not provide adequate speech understanding - OR you have normal hearing and are matched to a patient in the study by age, sex, and education level (as a control participant) **You may NOT be eligible if...** - You have a disability that prevents you from completing cognitive tests - You have a history of neurological or psychiatric disorders, including meningitis - You are currently on psychotropic medications - You are considered a vulnerable subject under French research protection rules Talk to your doctor to see if this trial is right for you.