Transcranial Magnetic Stimulation (TMS)
Transcranial magnetic stimulation (TMS) is used to briefly activate nerve cells in a small area on the surface of the brain. The stimulator device uses the principle of electromagnetic induction. An electrical current is passed very briefly through a coil of copper wires held on the surface of the scalp. This current induces a magnetic field around the coil which, in turn, induces an electrical current in the underlying nerve cells on the surface of the brain.