This is an open prospective comparative monocentric study, pilote, that randomised 60 patients in three groups of 20. This study will select 18 to 55 years old patients, with HIV infection controlled under antiretroviral therapy stble for 12 months and cognitive impairment objective on two neuropsychological evaluations separated from 6 months at least. All selected patients must have been explored by cerebral RMN or scanner