Anelectroencephalogram (EEG)is a recording of brain activity.

During the test, small sensors are attached to the scalp to pickup the electrical signals produced when brain cells send messages to each other.

These signals are recorded by a machine and are looked at by a doctorlater to see if they're unusual.

The EEG procedure is usually carried out by a highly trained specialist called a clinical neurophysiologist during a short visit to hospital.

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Medically Reviewed by a doctor on 24 Nov 2016