Neurocognitive Impairment After Ischemic Stroke

Inclusion Criteria: * Age: 18 to 45 years. * Pathology: ischemic stroke diagnosed with brain MRI as per standard clinical practice, with or without occlusion of proximal artery, anterior or posterior circulation. * Ability to understand and complete study tests and questionnaires: fluent French speaker and reader. * All patients must be affiliated to a social security scheme. * Signature of informed consent form. Exclusion Criteria: * Pre-existing cognitive impairment (defined as CQI \<78 or clinical dementia). * Severe functional dependence prior to stroke (defined as Modified Rankin Scale MRS = score 5). * Any neurological or psychiatric comorbidity. * Sensory disorders: visual impairment, blindness, deafness. * Severe acquired phasic disorders: on the expressive oral side, in the presence of an inability to express oneself, which interferes with the collection of responses to neuropsychological tests; and on the receptive oral side, in the presence of an inability to understand the instructions of neuropsychological tests. Phasic functioning is systematically assessed during hospitalization by means of the NIHSS (score ≤ 2 on the "Language" sub-test), and will be rechecked clinically and psychometrically during neuropsychological assessments using the Language Screening Test (LAST) for both expression and oral comprehension. - Severe motor disorders: inability to mobilize the dominant upper limb for written neuropsychological tests. * Contraindication to MRI. * Pregnant women. * HIV-positive patients: interaction of infectious pathology on cognitive functioning. Declarative, no HIV tests will be performed. * Withdrawal of informed consent. * Consumption of alcohol and/or narcotics on the day of neuropsychological assessments.