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Your brain waves have been measured.

The brain is made up of several areas. For example, the cerebrum is used to think and plan actions. In the cerebellum, movements are initialized and coordinated. The brain stem is responsible for various unconscious tasks such as breathing. The brain stem passes into the spinal cord.

Many of the brain’s processes involve mild electrical currents flowing to the nerve cells. Some of these currents can be measured in the scalp. To take the measurements, various metal plates are laid on the scalp. These are used to test different parts of the brain.

The brain waves are represented as lines or waves on a screen or on paper. If part of the brain is particularly active during the testing, the lines or waves may change there. This is the case with certain activities or sensations during the testing, for example. The brain wave measurements can enable an assessment of which area is active during which activity.