  The main objective of the electrical stimulation of the brain is to generate
action potentials from the application of electromagnetic fields. Among the
available techniques, transcranial electrical stimulation (TES) represents a
popular method of administration that has the advantage of being non-invasive
and economically more affordable. This article aims to briefly introduce the
reader into the understanding of TES in terms of the physics involved as well
as for some of the relevant results of studies applying this technique.
