electroencephalography

electroencephalography is a topic covered in the Taber's Medical Dictionary.

To view the entire topic, please or purchase a subscription.

Nursing Central is the award-winning, complete mobile solution for nurses and students. Look up information on diseases, tests, and procedures; then consult the database with 5,000+ drugs or refer to 65,000+ dictionary terms. Explore these free sample topics:

Nursing Central

-- The first section of this topic is shown below --

(ĕ-lek″trō-ĕn-sef″ă-log′ră-fē )

[electro- encephalography]
Amplification, recording, and analysis of the electrical activity of the brain.
SEE: electroencephalogram
Electrodes are placed on the scalp in various locations. The difference between the electric potential of two sites is recorded. The difference between one pair or among many pairs at a time can be obtained. The most frequently seen pattern in the normal adult under resting conditions is the alpha rhythm of 8.5 to 12 waves per sec. A characteristic change in the wave occurs during sleep, on opening the eyes, and during periods of concentration. Some people with intracranial disease will have a normal electroencephalogram (EEG), but others with no otherwise demonstrable disease will have an abnormal EEG. Nevertheless, the use of this diagnostic technique has proved to be very helpful in studying epilepsy and convulsive disorders and in localizing lesions in the cerebrum.

SEE: alpha rhythm; SEE: beta rhythm; SEE: theta wave

-- To view the remaining sections of this topic, please or purchase a subscription --