1. A system for transcranial stimulation of a head region of a subject, comprising: an electrode arrangement comprising a plurality of electrodes coupled to at least one electrode drive arrangement, wherein the plurality of electrodes are operable to contact onto a scalp of the head region of the subject, wherein the at least one 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; and a monitoring arrangement configured for monitoring spatial positions of the plurality of electrodes relative to one or more of the head region of the subject or mutual relative positions of the plurality of electrodes, and for indicating positional errors of the one or more of the plurality of electrodes for enabling one or more of a repositioning of the plurality of electrodes or a change in the electrical signals applied to the plurality of electrodes, for providing improved transcranial stimulation of the head region of the subject, wherein the electrode arrangement includes features which enable spatial positions of the plurality of electrodes relative to the head region to be measured using a sensing arrangement of the monitoring arrangement, wherein the sensing arrangement is coupled to computing hardware of the monitoring arrangement for computing the positional errors of the one or more electrodes.
2. The system as claimed in claim 1 , wherein the sensing arrangement is implemented, at least in part, using a mobile wireless communication device equipped with at least one imaging sensor for imaging the features for generating at least one image signal for the computing hardware for use in computing the positional errors.
3. The system as claimed in claim 1 , wherein the computing hardware is implemented at least in part remotely from the electrode arrangement, and coupled via a communication network to the sensing arrangement and the drive arrangement.
4. The system as claimed in claim 2 , wherein the mobile wireless communication device is implemented using at least one of: a smart phone, a cell phone, a mobile telephone, a wireless-enabled tablet computer, a wireless-enabled phablet computer, a wearable wireless-enabled computer, a wireless-enabled wrist-worn computer.
5. The system as claimed in claim 1 , wherein the features include at least one of: one or more light sources which are individually excitable for indicating the spatial positions of their respective electrodes relative to the head region of the subject; and figures with a combination of colours.
6. The system as claimed in claim 1 , wherein the system is operable to adjust one or more drive signals generated by the drive arrangement for the plurality of electrodes as a function of the positional errors and to provide an indication of repositioning of the electrode arrangement that is required to be performed on the subject to reduce the positional errors.
7. The system as claimed in claim 1 , wherein the computing hardware is operable to access at least one database, for retrieving information for use in computing the positional errors.
8. A method of implementing transcranial stimulation of a head region of a subject, wherein the method includes: using an electrode arrangement comprising a plurality of electrodes coupled to at least one electrode drive arrangement, wherein the plurality of electrodes are operable to contact onto a scalp of the head region of the subject; using the at least one drive arrangement to generate electrical signals for driving the plurality of electrodes to cause transcranial stimulation of the head region of the subject; using a monitoring arrangement for monitoring spatial positions of the plurality of electrodes relative to one or more of the head region of the subject or mutual relative positions of the plurality of electrodes, and for indicating positional errors of one or more of the plurality of electrodes for enabling one or more of a repositioning of the plurality of electrodes or a change in the electrical signals applied to the plurality of electrodes, for providing improved transcranial stimulation of the head region of the subject; and employing features of the electrode arrangement for enabling spatial positions of the plurality of electrodes relative to the head region to be measured using a sensing arrangement of the monitoring arrangement, wherein the sensing arrangement is coupled to computing hardware of the monitoring arrangement for computing the positional errors of the one or more electrodes.
9. The method as claimed in claim 8 , wherein the method includes implementing the sensing arrangement, at least in part, using a mobile wireless communication device equipped with the at least one imaging sensor for imaging the features for generating the at least one image signal for the computing hardware for use in computing the positional errors.
10. The method as claimed in claim 8 , wherein the method includes implementing the computing hardware at least in part remotely from the electrode arrangement, and coupled via a communication network to the sensing arrangement and the drive arrangement.
11. The method as claimed in claim 10 , wherein the method includes implementing the mobile wireless communication device using at least one of: a smart phone, a cell phone, a mobile telephone, a wireless-enabled tablet computer, a wireless-enabled phablet computer, a wearable wireless-enabled computer, a wireless-enabled wrist-worn computer.
12. The method as claimed in claim 8 , wherein the method includes arranging for the features to include one or more light sources which are individually excitable for indicating one or more of the spatial positions of their respective electrodes relative to the head region of the subject or a mutual relative position of the plurality of electrodes.
13. The method as claimed in claim 8 , wherein the method includes adjusting one or more drive signals generated by the drive arrangement for the plurality of electrodes as a function of the positional errors and to provide an indication of repositioning of the electrode arrangement that is required to be performed on the subject to reduce the positional errors.
14. The method as claimed in claim 8 , wherein the method includes operating the computing hardware to access at least one database, for retrieving information for use in computing the positional errors.
15. A software product stored on non-transient machine-readable data storage media, wherein the software product is executable upon computing hardware for implementing a method as claimed in claim 8 .
