This electrode scheme is an extension of the famous 10-20 system to accommodate large number of electrodes. The 5 electrode system contains the standard locations of the original 10-20 system (see image to the side, click image to enlarge) and those of the 10-10 system. Due to the small inter-electrode distances the caps allows the positioning of more than 300 electrodes.

Since this system is a logical extension of the 10-20 system we have used a smart color coding of all electrodes on the WaveGuard cap. This makes it easier to the find the different electrodes on the cap. In the case of a 128-channel cap,
the first 32, second 32 electrodes and so on have different colors.

Details regarding this electrode system including an explanation of the nomenclature for the electrode locations can be found in a paper by Oostenveld and Praamstra.



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