The present disclosure relates to an acquisition device intended to be positioned on the head of a user in order to perform an encephalogram. The device comprises at least one acquisition electrode (32, 34, 33) configured in order to be positioned in contact with the head of the user at at least any one of the positions of the international 10-20 system, so as to acquire at least one brain activity signal representative of the brain waves of the user and at least one first and one second means of adjusting the position of the acquisition electrode in a first and a second plane, respectively.
