An electroencephalogram (EEG or brain wave test) is used to diagnose epilepsy and other seizure disorders, infectious diseases, tumors, trauma, hematomas, metabolic abnormalities, degenerative diseases and periods of unconsciousness and confusion.
In some cases, an EEG provides useful information regarding sleep and wakefulness.
An electroencephalogram may also be one criterion in establishing brain death (complete absence of brain waves in two EEGs taken 24 hours apart).
To record an EEG, 16 to 30 electrodes are applied to the scalp and connected by wires to an amplifier and recorder (electroencephalogram). Brain electrical signals are displayed as a series of wavy lines on a moving sheet of graph paper.
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