Fig. 2

Electrode positions and labels in the 10-20 system Oostenveld and Praamstra (2001). Black circles indicate positions of the original 10-20 system, gray circles indicate additional positions introduced in the 10-10 extension. Each site has a letter to identify the general brain region and a number to identify the hemisphere location. The letters, Fp, F, T, C, P, and O stand for fronto-polar, frontal, temporal, central, parietal, and occipital, respectively. For further explanation of the 10-20 system, see Oostenveld and Praamstra (2001)