Transcranial Magnetic Stimulation or TMS is far from being a miracle, but the procedure has opened new ways to understand the brain. These ways are different from functional MRIs which view the activity of the brain in real time. TMS allows us to see the deeper and more subtle result of stimulating our brain cells. It allows us to identify what part of the brain does what, more accurately.
If you break the process down to its simplest steps, it’s basically putting an electromagnet on top of your head. The magnet activates in pulses using a machine that controls both the strength and the frequency. The electromagnet’s activation causes a somewhat loud “tick” sound akin to the sparks of electricity when inserting an electric plug into a socket. The machine generates high voltage bursts that deliver powerful electromagnetic waves. But despite the raw power fed to the magnets, it’s harmless to the receiver.
TMS Parts in General
There are two kinds of TMS. There’s the original TMS where there’s a large electromagnetic coil positioned on a certain part of your head to deliver single pulses. The other one is called Repetitive Transcranial Magnetic Stimulation or rTMS. It’s often a smaller pair of the electromagnet that delivers repetitive weaker bursts of electromagnetism over a period of time. Both of them have the same general parts.
The Electromagnets or Conductors
While it can be explained as simply aiming the magnets, how it actually works is a bit more complex. The magnets are composed of two coils that deliver a “beam” of electromagnetism. The two beams on their own are weak and won’t affect the brain that much. When they cross, however, the combined energy is enough to properly stimulate whichever part they land on. This is how TMS can stimulate specific parts of the brain.
The Pulse Generator
Basically, the machine that generates electricity to activate the electromagnets. The machine comes with a control panel that allows the user to alter the amount of electricity that flows to the electromagnet. They can also control the frequency of the pulses. The pulse generators are relatively large and heavy. But recent advancement in technology allowed development of smaller, semi-portable machines.
All in One TMS Machines
Since machines are getting smaller these days, so are TMS pulse generators. There are commercially released products where the magnet and the pulse generators come as one device. These relatively lightweight devices can be placed on your head to deliver pre-programmed frequencies.
The key to getting the right effect is to conduct the therapy continuously. TMS clinics offer programs that have 40-60 minute sessions every day for 5-7 days a week, lasting for 20-30 days. On average, people experience improvements in their depression and anxiety. What concerns most first-time users are the lack of sensations during the first few rounds of stimulation. Proof that it affects the brain is shown through the muscle twitches caused when the magnet is aimed at the motor part of the brain which controls your muscles. The procedure is indeed slow, which is important as so to avoid causing stress or damage.