A system for transcranial stimulation of a head region of a subject includes an electrode arrangement having a plurality of electrodes coupled to an electrode drive arrangement. The electrodes are operable to contact onto a scalp of the head region of the subject and the drive arrangement is operable to generate electrical signals for driving the plurality of electrodes to cause transcranial stimulation of the head region of the subject. The system further includes a monitoring arrangement for monitoring spatial positions of the plurality of electrodes relative to the head region of the subject, and for indicating positional errors of the electrodes for enabling repositioning of the electrodes and/or a change in the electrical signals applied to the electrodes, for providing improved transcranial stimulation of the head region of the subject and/or mutual relative positions of the plurality of electrodes.
