Reportage in the stereotactic neurosurgery operating theatre in Pasteur 2 Hospital, Nice, France. Treating Parkinson disease through deep brain stimulation. This technique consists of implanting electrodes in the brain, which modulate abnormal cerebral electrical activity. The room is equipped with a pre-op O-arm scanner and NeuroMate, a stereotactic robot. The robot enables surgeons to optimize and increase reliability of their operating technique, and the O-arm enables real time 3D images to be obtained to improve the precision, safety and efficiency of the operation. A radio technician monitors data while the electrodes are being placed.