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Electrode arrangement according to the international 10/20 system

Electrode arrangement according to the international 10/20 system

EEG Electrode arrangement according to the international 10/20 system

Download the poster as a PDF file here

Two anatomical measuring points are used for the correct placement of the EEG electrodes:
Firstly, the nasion, i.e. the point between the forehead and nose, and secondly, the inion, the lowest point of the skull on the occiput, which is usually characterized by a clear projection.
The following connecting lines are divided into 10-20-20-20-20-10% sections:
From the root of the nose (nasion) to the protuberantia (inion), from the left ear canal opening (A1) to the right (A2) and both semicircles from nasion to inion, each via A1 and A2.
 
The electrodes are arranged according to the 10/20% sections (see illustration) and are placed symmetrically at equal intervals.

 

The letters F, T, C, P and O stand for frontal, temporal, central, parietal and occipital.
A “z” (zero) denotes the electrode that is placed on the center line.
Even numbers (2, 4, 6, 8) indicate electrode positions on the right hemisphere, while odd numbers (1, 3, 5, 7) refer to the left hemisphere.
 
In adults, the distances between the electrodes are between 5 and 7 cm.
 
The designations of the electrode positions (lead points) correspond to the corresponding anatomical designations.
Electrode arrangements based on this measurement method guarantee reproducibility.
For smaller heads, this arrangement can be simplified by reducing the electrodes.

Download the poster as a PDF file here 

EEG Electrode arrangement according to the international 10/20 system