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<p class="MsoNormal"><span style="color:#1F497D">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I am conducting an experiment where participants imagine a movement, and I am collecting eeg data to analyse the event-related desynchronisation. I had a couple of participants’ data that look a bit weird when
uploaded on EEGLAB. (v. 14.1.1). Data was collected using an ANT eego sport system, and it was recorded online with reference to CPz, but was re-referenced offline to the average of the two mastoid electrodes. Data was uploaded on EEGLAB using the ANT extension
(.cnt format).</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The data has also been band-pass filtered 2-45 Hz, but the signal looks different from the one I collected. I also checked if the original file had this same problem (the non-re-referenced one), and yes, it has
the same problem. I have uploaded the same file (same extension), in brainstorm, another Matlab toolbox for EEG analysis, and the signal looks completely different.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I also have run the power spectrum analysis on both software, and I looks that in EEGLAB, even though I band-pass filter 2-45 Hz, it does not remove the 50Hz. On the contrary, in Brainstorm it does remove it.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Do you know what may be the problem here, and why the 50 Hz are not removed?</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind Regards<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">FABIO<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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