The Links Between Executive and Linguistic Processes and Their Lesional Determinants From a Verbal Fluency Task

Inclusion Criteria: * For Cognitive cortical neurodegenerative diseases PATIENTS * informed consentPatients between 40 and 85 years old, * French native language, * Social Security affiliation, * Can read, write and count (up to 36) and knows the alphabet * Assessed in Amiens University Memory Clinic for: * Mild severity impairment (MMSE\> 19) or major severity impairment related to: * AD according to Albert criteria and McKhann criteria * DCL according to McKeith criteria * FTLD according to Rascovsky criteria * CBD according to Armstrong's criteria * PSP according to Höglinger criteria * For Stroke PATIENTS * informed consent * Patients between 40 and 85 years old, * French native language, * Social Security affiliation, * Can read, write and count (up to 36) and knows the alphabet * Having suffered a stroke, hospitalized in neurology, visualized by imaging Exclusion Criteria: * Mental retardation or guardianship * Other current or past brain condition affecting cognition, including: * Severe head trauma * Epilepsy prior to stroke still requiring previous treatment * Parkinson disease, multiple sclerosis * Brain tumor or brain radiation therapy * Current or past schizophrenia or psychosis * Active or past psychiatric impairments requiring a stay\> 2 days in a specialized environment * Contra indication to MRI * Comorbidity with life expectancy \<1 year * Comorbidity affecting cognition in particular: * Alcohol (\> 3 glasses / day) or history of alcohol withdrawal syndrome * Opiate or cocaine addiction or opiate withdrawal syndrome * Renal failure (dialysis or creatinine clearance \<30) * Hepatic failure (spontaneous INR\> 1.5 or PT \<60%) * Respiratory failure requiring oxygen therapy * Heart failure (orthopnea\> 2 pillows) * Persistent vigilance disorder (NIHSS1a score ≤1) * Cancer with paraneoplastic syndrome * Treatment with gold salts, D Penicillamine or other treatment with cognitive effect * Patient under guardianship or curators or private under public law * Pregnant and / or lactating woman