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\section{Spontaneous oscillatory activity}  Alpha rhythm can be induced or suppressed by closing and opening one's eyes. From Fig.~ \ref{fig_spectra} Fig.~\ref{fig_spectra}  we can see that there's a clear spike in the 10 Hz area in data 1. Compared to the data set 2 where there are no clear spikes it's pretty safe to assume that data 1 was recorded with eyes closed and data 2 with eyes opened.