Reportage on the removal of a cerebral tumor (glioma) while awake at Nice Hospital, France. Awake surgery consists of waking the patient during the operation in order to precisely locate, using electrical stimulation, crucial areas for vital functions (language, motor function etc.), with the aim of preserving them during the ablation of the tumor. The patient is awake and the speech therapist carries out cognitive tests. The electrical stimulation on contact with the neuronal network disturbs these tests and leads to a failure in the requested tasks. This enables the surgeon to know if he is in a vital area.