The invention provides electrode apparatus for non-invasively applying electrical stimulation to a body portion of a human subject by way of a skin interface, the electrode apparatus comprising: an electrode module having: an end for defining an electrolyte application region between the electrode module and the skin interface and a plurality of electrodes which are electrically couplable or electrically coupled to the skin interface by way of an electrolyte in the said electrolyte application region, the electrodes being spaced apart from each other and a controller in communication with the electrodes, the controller being configured to individually adjust electrical signals across or between each of the said electrodes and each of one or more pairing electrodes.
