<div dir="ltr"><div class="gmail_default"><font color="#000000" face="arial, helvetica, sans-serif">Greetings Kornelia, happy new year, hoping there below helps a little:</font></div><div class="gmail_default"><font color="#000000" face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><font color="#000000" face="arial, helvetica, sans-serif">I think the general guideline is to not include in your ICA runs those channels which are used as the (online) reference(s) during the actual recording session. Overall, "t<span style="line-height:22px">he effect of an active reference on EEG recording is one of the oldest technical problems in the study of human EEG". </span></font><span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif">Some discussion of single and multi-channel common references can be found here: </span><span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif"><a href="http://sccn.ucsd.edu/wiki/Chapter_04:_Preprocessing_Tools">http://sccn.ucsd.edu/wiki/Chapter_04:_Preprocessing_Tools</a> . </span><font color="#000000" face="arial, helvetica, sans-serif">Please also consider reviewing </font><span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif">Luck's ERP handbook for some discussion of referencing. Cheers!</span></div><div class="gmail_default"><font color="#000000" face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><br></div><div class="gmail_default"><div class="" style="font-size:0.8465em;line-height:1.45em;color:rgb(0,0,0);font-family:arial,helvetica,clean,sans-serif"><br></div></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 30, 2014 at 10:57 AM, Kornelia Gentsch <span dir="ltr"><<a href="mailto:Kornelia.Gentsch@unige.ch" target="_blank">Kornelia.Gentsch@unige.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Dear all,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Sorry for asking the same question again but I am confused because of opposing replies. One reply was that it is okay to keep Cz for ICA when Cz is the reference channel for importing Biosemi EEG data into EEGlab (the reference channel
is flat after the data were imported). The other reply was that when Cz is the reference channel for data import it must be removed prior to ICA.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Could you please let me know which reply is the correct one?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thank you very much in advance!<span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></p><span class="HOEnZb"><font color="#888888">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Kornelia<span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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