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Figure 7–3. The 10–20 International System of Electrode Placement.

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Figure 7–3. The 10–20 International System of Electrode Placement.Electrodes are labeled according to their approximate locations over the hemispheres (F = frontal, T = temporal, C = central, P = parietal, and O = occipital; z designates midline); left is indicated by odd numbers and right by even numbers. A parasagittal line running between the nasion and inion and a coronal line between the preauricular points is measured. Electrode placements occur along these lines at distances of 10% and 20% of their lengths, as illustrated. In most clinical laboratories, the Fpz and Oz electrodes are not placed, but are instead used only as reference points. Fp1 is placed posterior to Fpz at a distance equal to 10% of the length of the line between Fpz- T3-Oz; F7 is placed behind Fp1 by 20% of the length of that line. O1 is placed anterior to Oz at a distance equal to 10% of the length of the line between Oz-T3-Fpz; T5 is placed anterior to O1 by 20% of the length of that line. F3 is placed halfway between Fp1 and C3 along the line created between Fp1-C3-O1; P3 is placed halfway between O1 and C3 along that same line. Right hemisphere electrodes are placed in similar fashion. Reference electrodes, in this case placed on the ears, are labeled A1 and A2.

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