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Electroencephalography (EEG) records the electrical activity in the brain. During an EEG various electrodes are placed on the patient's skin to record brain activity.
An EEG can be performed under different conditions: With the patient asleep or even subjected to stimulus such as a flashing light, or after breathing deeply to introduce metabolic changes that reveal an area of the brain with unusual brain activity.
There are different types of waves in the EEG; according to their frequency and amplitude. The normal EEG of a healthy person shows the so-called alpha waves with a frequency of 8 to 12 Hz, and a voltage of 50 microvolts. In the same way, beta or delta waves are described and detected that correspond to different pathologies.
The neurological diseases that benefit from the EEG are:
Sensors (electrodes) are placed on different parts of the head. This usually takes a few minutes and, as it is non-invasive, can be repeated as often as necessary.
An EEG is a routine test that poses no risks and can be repeated several times during a neurological illness.
Brain imaging tests are also useful and may allow more accurate diagnosis and treatment when combined with an EEG.
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