A Lexico-semantic Program on Tactile Tablet for Patients With Alzheimer's Disease

Inclusion Criteria: 1. Major Patient 2. Patient with a diagnosis of Alzheimer's disease according to DSM-IV and NINCDS-ADRDA criteria. 3. Patient at a moderate stage of the disease: Score at CDR (Clinical Dementia Rating Scale) between 0.5 inclusive and 2 inclusive and MMS score greater than or equal to 10 and lower strictly at 27 4. Lexical-semantic disorder 5. Treatment with pro-cognitive drugs at stable doses for at least 3 months, 6. Speech therapy in progress (2 or 3 sessions per week) 7. Patient with free and informed consent 8. Affiliated to the Health care system 9. Native french speaker, 10. Attendance of a caregiver. For the early onset group, patients should have started the disease before 65 years of age. The randomization will be stratified according to age (\<65 years or\> 65 years), enabling to include 2 groups of identical size of young AD (Alzheimer Disease) and Late (Alzheimer Disease) patients, each half distributed in the tablet or control group. Exclusion Criteria: 1. Other known neurological disease or general illness or major psychic problems that may interfere with cognitive functioning, 2. Patient under guardianship or curatorship 3. Confusion, 4. Cerebral MRI (or scanner for contraindication to MRI), obtained in the context of routine care compatible with a pathological process other than that related to Alzheimer's disease. A discrete or moderate leukoaraiosis (stages 1 and 2 of Fazekas) will not be considered as a criterion of non-inclusion. 5. Uncorrected hearing or visual impairment 6. Inclusion in another intervention protocol. 7. Participation in an additional stimulation workshop