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\section{Materials and Methods}  The EEG equipment used is was  from the g.tec company (www.gtec.at), consisting of 16 dry electrodes (g.SAHARAelectrode 7mm), a pre amplifier g.SAHARAbox, and the amplifier g.USBAmp. The electrodes are were  set on the cap using the extended 10/20 system (Figure \ref{fig:EP}), and the reference electrodes are were  placed above the mastoid as usual.