The transient global amnesia is a model for exploring memory because this disorder is massive, pure and temporary. Better understand the Neural Network substrates underlying this alteration could help to better understand memory disorders in other diseases (Korsakoff syndrome, thalamic stroke, dissociative amnesia, Alzheimer's disease). Such discovery could lead to clinical trials of functional brain stimulation as recently developed in other neurological disorders in which functional impairment has been shown. (TMS, TDCS)