Canadian Medical Guide > Analytical, Diagnostic and Therapeutic Techniques and Equipment > Diagnosis > Diagnostic Techniques and Procedures > Diagnostic Techniques, Neurological > Electroencephalography Terms and Definitions

Electroencephalography

Medical Definition:	Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.
Guide Notes:	/drug eff /rad eff permitted; do not use /util except by MeSH definition; DF: note short X ref
Also Called:	Electroencephalogram

Electroencephalography Categories.

	Alpha Rhythm - One of four types of brain waves characterized by a relatively high voltage or amplitude and a frequency of 8-13 Hz. They constitute the majority of waves recorded by EEG registering the activity of the parietal and occipital lobes when the individual is awake, but relaxed with the eyes closed.
	Beta Rhythm - Brain waves with frequency greater than 13 Hz seen on EEG during wakefulness.
	Cortical Synchronization
	Delta Rhythm - One of the four types of brain waves seen on EEG characterized by a high amplitude and a frequency of 4 Hz and below. They are considered the "deep sleep waves" observed during sleep in dreamless states, infancy, and in some brain disorders.
	Theta Rhythm - One of four types of brain waves, characterized by a frequency of 4-7 Hz, usually observed in the temporal lobes when the individual is awake, but relaxed and sleepy.

Electroencephalography Medical Definitions and Terms

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