A committee of the International Federation of Societies for Electroencephalography and Clinical Neurophysiology recommended a specific system of electrode placement for use in all laboratories under standard conditions. According to their recommendations, the recording electrodes are named with a letter and a subscript.
The letter is an abbreviation of the underlying region: Fp (frontopolar), F (frontal), C (central), P (parietal), O (occipital) and A (auricular). The subscript is letter z, indicating zero or midline sagittal placement, or a number, indicating lateral placement. Odd numbers refer to electrodes on the left; even numbers refer to electrodes on the right side of the head. Therefore, F3 would be left frontal, Fz would be midline frontal and F4 would be right frontal position.
The inferior frontal electrodes F7 and F8 are often called ‘anterior temporal’ electrodes because they are placed closed to (and record activity from) the anterior temporal area.
References:
- Jasper, H. Report of committee on methods of clinical exam in EEG. Electroencephalogr. Clin. Neurophysiol. 10:370-375
- Guideline One: Minimum Technical Requirements for Performing Clinical Electroencephalography. J. Clin. Neurophysiol. 11 (1) 2-5, Raven Press Ltd. New York
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