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\textbf{Beta band:} for task blocks, one can found noticeable peaks at 16 Hz, 18 Hz and 21 Hz frequencies on the right side of the scalp. Besides, there is also a decrease in frequency amplitude between 20 Hz to 24 Hz to the same kind of experiment block and for most channels. Regardin the left side of the scalp, for task blocks, most electrodes showed a decrease in amplitude at 17 Hz, 19 Hz and 24 Hz. The electrode that stands out for this band is FC1, which has clear differences between blocks at 15, 17, 19.5, 22 and 27.5 Hz frequencies. To most frequencies, task amplitude is lowered when compared to rest periods.  In [Fernández et al., 1995], the authors of the study operated with a similar EEG setup and got some similar results. They also found that the delta band was the most easily distinguishable regarding task and rest conditions. Also, differences of power contribution to the alpha band frequencies also showed a decrease for task blocks. Results to the theta and beta bands were also similiar similar  to what we have observed in this study. It is also important to note that some studies [Grabner and De Smedt, 2012; Pauli et al., 1994] show that training mental calculations causes a variation in the EEG response recorded. Therefore, the data we have analyzed in this study might be linked to the subject's level of mental calculation training. Furthermore, since this was a very simple study, we had only one subject; a greater number of volunteers could have yelded a more statically significant result.