The Transcranial magnetic stimulation (TMS) is a noninvasive method to excite neurons in the brain: weak electric currents are induced in the tissue by rapidly changing magnetic fields (electromagnetic induction). This way, brain activity can be triggered with minimal discomfort, and the functionality of the circuitry and connectivity of the brain can be studied. Repetitive transcranial magnetic stimulation (rTMS) can produce longer lasting changes. Repetitive Transcranial Magnetic Stimulation, or rTMS, is a procedure in which electrical activity in the brain is influenced by a pulsed magnetic field. The magnetic field is generated by passing brief current pulses through a coil of wire. This coil of wire is encased in plastic and held close to the scalp so that the magnetic field can be focused onto specific areas of the cortex, or surface, of the brain. The magnetic field that is generated in rTMS can penetrate the scalp and skull safely and painlessly to induce a current in specific neurons (brain cells). Because the magnetic stimulation is delivered at regular intervals, it is termed repetitive TMS, or rTMS. The uses of TMS and rTMS included diagnostic and therapeutic uses. rTMS is used in treatment of psychiatric disorders, such as major depression, and auditory hallucinations, neurological disorders neurological conditions, such as migraine, stroke, Parkinson's disease, and dystonia, and children with developmental disabilities or delay, such as autism, and cerebral palsy.