Sofía I. Coto Guzmán edited From_the_ensemble_of_graphics__.tex  over 8 years ago

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From the ensemble of graphics in figure \ref{fig:delta}, it is possible to notice that practically all frequency responses were very similar in what seems to be the very first 0.5 Hz. To almost all electrodes, the greatest frequency contribution occurred before the 1 Hz value, which is  expected from the ease of integration during measurement of these kinds of components. FC1 electrode, in particular, had a peak between 1 Hz and 2 Hz that is as great in magnitude as the first one. In general, task frequency amplitude was greater for almost each frequency in the delta band, for all sixteen electrodes. Most of the channels displayed this response, in particular, in values of frequency up to 2 Hz. Greater differences in the frequency spectrum between task and rest states seemed to be found in FFC3 and FC1 electrodes (both on the left side of the scalp). The first one, in particular, presented an almost well defined peak at 3 Hz. The other one had a tall peak at almost 2 Hz and another peak at, also, 3 Hz. Interestingly enough, a well defined peak at 3 Hz was also found at Oz electrode (occipital area) for the mean task block. There were smaller peaks at about 1.5 Hz and 2.5 Hz, that also seemed to appear on rest blocks, although less evident. We believe this was due to the change in visual stimulus between rest and task blocks during the experiment.