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\section{Materials and Methods}  The EEG equipment used is 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 set on the cap using the extended 10/20 system (Figure\ref{fig:EP}), (Figure \ref{fig:EP}),  and the reference electrodes are placed above the mastoid as usual. The acquisition paradigm (Fig. 2) (Figure \ref{fig:paradigm})  consisted of alternating 6 s blocks of rest and task, that involved doing sums from a series, multiplication of a series or addition of fractions from a series.