1-20b.y:

Magnetic signals were used to study your brain functions.

The brain is located inside the head. It receives, processes and stores sensory impressions. The brain controls movements and various physical functions.

The brain consists of very many individual nerve cells. Many of the brain’s processes involve mild electrical currents flowing to the nerve cells. These generate weak magnetic signals.

To do the testing, a test device was placed over your head. The device looks like a large helmet. The test device does not make contact with your head. This test device incorporates a great many small sensors. The sensors are arranged around your head. The sensors measure the change in magnetic signals in the nerve cells in the brain. A device then records the signals as waves or lines. This can help assess nerve cell activity, for example.