The name alone is worth a click: Transcranial Magnetic Stimulation. And it received its first approval from the FDA this week:

Transcranial Magnetic Stimulation Device Approved By FDA For Depression Treatment

The current application of the device is for the treatment of depression. This video helps you to understand what a depression patient might be going through prior to treatment:

The following video shows how TMS can deactivate a part of the brain:

It’s a pretty simple technique. Capacitors send a large amount of current through a coil to create an intense magnetic field. The field penetrates the brain and induces a current. The current can disrupt parts of the brain. Aiming the magnetic field lets you control the affected parts of the brain.

For more info see: Transcranial Magnetic Stimulation

[See previous invention]