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... Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity of the brain.It is typically noninvasive, with the electrodes placed along the scalp, although invasive electrodes are sometimes used, as in electrocorticography, sometimes called intracranial EEG.. EEG measures voltage fluctuations resulting from ionic current within the neurons of the brain. Brainwaves Escape Rooms are for everyone.