Inclusion Criteria:  Transient ischemic accident Group  Patient over 60 years of age with a transient ischemic attack (focal neurological deficit of less than 24 hours without ischemic injury on diffusion MRI performed in the week following the event.) Patient having signed a free and informed consent to participate in the Normandy-Stroke cohort.  Control group  Subject over 60 years old Subject included in the Medit-AGEING research protocol Subject with one or more risk factor (s) for cerebrovascular disease Subject not opposing the use of their data for the Cog-Tia study  Non inclusion criteria  Transient ischemic accident Group  Patient with contraindications to performing a brain MRI Neurological co-morbidity (history of severe head trauma, dementia, brain tumor, stroke, psychosis) Refusal to participate in the Normandy-Stroke cohort Persons deprived of their liberty by a judicial or administrative decision, persons undergoing psychiatric care, persons admitted to a health or social establishment for purposes other than that of research Adult persons subject to a legal protection measure or unable to express their consent  Control group  - Subject refusing to the use of their data for the Cog-Tia study  Exclusion Criteria:  New stroke during the study participation