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b>EEG: Electroencephalogram, e technique for studying the electrical
current within the brain. Electrodes are attached to the
scalp. Wires attach these electrodes to a machine which
records the electrical impulses. The results are either
printed out or displayed on a computer screen. Electroencephalogram is abbreviated EEG.
Different patterns of electrical impulses can denote various problems in the brain including different forms of
epilepsy. Most EEGs see only a moment in time within the
brain, and can catch only gross abnormalities in function.
An overnight EEG is designed to check the electrical
activity in the brain of a sleep-deprived patient,
increasing the chance that seizure activity will be
revealed. Also available are 24- or 48-hour EEGs, which
measure electrical activity over one or two days, usually
using mobile EEG units.
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