Neurophysiological Basis of Electroencephalography, Polarity and Montage

Meltem DİREKa, Mustafa KÖMÜRb, Çetin OKUYAZb

aÇocuk Nörolojisi Kliniği, Van Eğitim ve Araştırma Hastanesi, Van, TÜRKİYE
bÇocuk Nörolojisi BD, Mersin Üniversitesi Tıp Fakültesi, Mersin, TÜRKİYE

ABSTRACT
The electrophysiological diagnosis of electrical activity in nerve cells recorded by electrodes placed on the scalp is called electroencephalography (EEG). The polarity also allows to distinguish between the (+) and (-) poles of a power source. During EEG recording, the electrical potentials from two different electrodes (G1, G2) are recorded in each channel. The EEG record in each channel is generated by recording the potential difference between G1 and G2. Montage is the arrangement of the electrode combinations used to record the EEG signals. Five types of montages are used in EEG recording. Localization of epileptic focus and possible artefacts are reviewed by montage. In this article, the neurophysiological basis of electroencephalography, a method which is commonly used in the diagnosis and differential diagnosis of epilepsy, polarization and assembly methods are briefly summarized.
Keywords: Electroencephalography; montage; polarity

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