The present invention provides an electrode headset grid adapted to fit on a head of a human subject, the grid comprising a plurality of conductive regions, electrically isolated from each other, wherein the conductive regions are configured to contact at least one electrode, and wherein the configuration of the conductive regions is configured to define an operating electrode unit. There is further provided an integrated system for brain electric stimulation and EEG monitoring, the system comprising the electrode headset grid and a plurality of electrodes. The invention further provides use of the electrode headset grid in an integrated non-invasive brain electrical stimulation and monitoring procedure,
