Carlos Alberto Stefano Filho edited From_the_ensemble_of_graphs__.tex  over 8 years ago

Commit id: f5f095f1f4f4ff376e18b7030d685e50d0226b14

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From the ensemble of graphs graphics  above, it is possible to notice that practically all frequency responses are very similar in what seems to be the very first 0.5 Hz. To almost all electrodes, the greatest frequency contribution occurs before the 1 Hz value. FC1 electrode, in particular, shows a peak between 1 Hz and 2 Hz that is as great in magnitude as the first one. In general, task frequency amplitude is greater for almost each frequency in the delta band, for all sixteen electrodes. Most of the channels show this response, in particular, in values of frequency up to 2 Hz. Greater differences in the frequency spectrum between task and rest states seem to be found in FFC3 and FC1 electrodes (both on the left side of the scalp). The first one, in particular, presents an almost well defined peak at 3 Hz. The other one has a tall peak at almost 2 Hz and another peak at, also, 3 Hz. Interestingly enough, a well defined peak at 3 Hz is also found at Oz electrode (occipital area) for the mean task block. There are smaller peaks at about 1.5 Hz and 2.5 Hz, that also seem to appear on rest blocks, although a lot less evident. We believe this is due to the change in visual stimulus between rest and task blocks of the experiment.