<div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000">Dear all, </font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000"><br></font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000">I am preprocessing my data and I want to run ICA for artifact rejection on 1Hz-filtered data and then apply weights to 0.1Hz-filtered data... </font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000"><br></font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000">From what I understand, the EEGLAB <i>eegfiltnew </i>function uses passband edges which do not exactly correspond to cutoff frequencies.</font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000"><br></font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000">Am I right to assume that to get a 1Hz high-pass filter I should enter a 2Hz edge?</font></div><div class="gmail_default" style="font-family:georgia,serif"><font color="#000000"><br></font></div><div class="gmail_default"><font color="#000000"><font face="georgia, serif">EEG = pop_eegfiltnew(EEG, [],2,[],true,[],1);</font><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000">and to get 0.1 I should enter 0.2Hz?</font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000">EEG = pop_eegfiltnew(EEG, [],0.2,[],true,[],1);<br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000">Also, only theoretically, is it possible to high-pass filter data twice? Would that distort the data and disable ICA?</font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000">Let's say we have a dataset filtered with a cutoff frequency of 0.1Hz but then we want to run ICA at 1Hz because it's the recommended threshold... Is it possible to take the 0.1 dataset and apply a more robust filter to it?</font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000">I would really appreciate your feedback!</font></div><div class="gmail_default"><font face="georgia, serif" color="#000000"><br></font></div><div class="gmail_default"><font face="georgia, serif" color="#000000">Karolina</font></div><div class="gmail_default"><font color="#0000ff" face="georgia, serif"><br></font></div><div class="gmail_default"><font color="#0000ff" face="georgia, serif"><br></font></div><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><font color="#000000"><br></font></div><div><span style="color:rgb(153,153,153)"></span></div><div><span style="color:rgb(153,153,153)">Institute of Applied Linguistics</span><br></div><div><font color="#999999">University of Warsaw<br>ul. Dobra 55<br>00-312 Warszawa<br></font></div><div><font color="#999999"><u><a href="http://www.ils.uw.edu.pl" target="_blank">www.ils.uw.edu.pl</a></u><br><br></font><span><font color="#000000"><u><a href="http://www.karolinabros.eu" target="_blank">www.karolinabros.eu</a></u></font></span></div></div></div></div></div></div>
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