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Electroencephalography (EEG)
Electroencephalography is the neurophysiologic exploration of the
electrical activity of the brain by the application of electrodes to
the scalp. The resulting traces are known as an electroencephalogram
(EEG) and represent so-called brain waves. This device is used to
assess brain damage, epilepsy and other problems. Historically four
major types of brainwave are recognized (alpha, beta, delta and
theta). There's no precise agreement on the frequency ranges for all
the frequency bands mentioned here.
Beta is the frequency range above 13 Hz. It's often associated with active, busy or anxious
thinking and active concentration.
Alpha is the frequency range from 8 Hz to 13 Hz. It's often
associated with a relaxed awake mind, daydreaming, watching TV or the
first stage in falling asleep.
Theta is the frequency range from 4 Hz to 7 Hz and is associated
with REM sleep, creativity, visual imagery, reverie and recollection.
Delta is the frequency range below 4 Hz and is often associated
with deep sleep.
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Uses of EEG
- Seizure disorders (such as diagnosis of epilepsy)
- Brain tumor or brain abscess
- Brain hemorrhage
- Cerebral infarct
- Head injury, encephalitis
- Sleep disorders (such as narcolepsy).
- EEG may confirm brain death in someone who is in a coma.
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