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The International 10-20 System of Electrode Placement

The International 10-20 System of Electrode Placement is the most widely used method to describe the placement of electrodes at specific intervals along the head. Each electrode site has a letter to identify the lobe, along with a number or another letter to identify the hemispheric location.


International 10-20 System of Electrode Placement
The letters used are:

F - Frontal lobe
T - Temporal lobe
C - Central lobe
P - Parietal lobe
O - Occipital lobe



"Z" refers to an electrode placed on the mid-line.
   
Even numbers (displayed in blue in the image above) refer to the right hemisphere and odd numbers (displayed in red in the image above) refer to the left hemisphere.

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