What is EEG?Electroencephalography, or EEG, is a neurological test that uses an electronic monitoring device to measure and record electrical activity in the brain.Special sensors (electrodes) are attached to your head and hooked by wires to a computer.
EEG measures voltage fluctuations resulting from ionic current flows within the neurons of the brain. The brain’s electrical charge is maintained by billions of neurons. Neurons are electrically charged (or “polarized)by membrane transport proteins that pump ions across their membranes. Brain electrical current consists mostly of Na+, K+, Ca++, and Cl- ions that are pumped through channels in neuron membranes.
The computer records your brain’s electrical activity on the screen or on paper as wavy lines. Thus the potential difference created by the electrical activity of the brain is used for diagnosing abnormal behavior. The electrodes are not harmful to your body.
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