Departments of Clinical Neurophysiology, Aarhus University Hospital, Aarhus and Danish Epilepsy Centre, Dianalund; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
Department of Neurology, Beth Israel Deaconess Medical Center, Harvard University, Boston, MA, USA
Correspondence: Sándor Beniczky
Danish Epilepsy Centre Filadelfia,
Visby Allé 5,
Electroencephalography (EEG) is the most commonly used functional investigative method in epilepsy. The goal of this educational review paper is to summarize the most important aspects related to the biophysical phenomena of EEG signal generation and the technical features that a clinician needs to understand in order to read and interpret EEGs. We explain the EEG electrodes and recording arrays, amplifiers, filters, analogue-to-digital conversion and signal display. We describe the advantages and disadvantages of the different montages and the indications for the various types of EEG recordings and provocative maneuvers. We explain how to use topographic maps to estimate the source of the cortical generator.
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