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\section{Materials and Methods}  The EEG equipment used is from the g.tec company, 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 10/20 system, and the reference electrodes are placed above the mastoid as usual.  The acquisition paradigm consisted of alternate 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.