How is an EEG taken?

EEG refers to electroencephalogram. This is a test to
measure the electrical activity of the brain. During the test special sensors or
electrodes are used to pick up electrical activity from the brain and analyze it. The
sensors are very sensitive and are connected with a conductive gel so that they can pick
up all the electrical activity. EEG can be used to diagnose any condition that causes a
change in the normal electrical activity of the brain like a
seizure.

EEGs are used to diagnose epilepsy, check for
dementia, see if a person in a coma still has a functioning brain and study other
disorders. It is used after brain surgery to see how the patient is recovering and
whether there are any problems to be looked at.