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<p class="MsoNormal">Dear all, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">I am using a 64 channel acticap, online reference FCz. To recover FCz I append a 65th channel and rereference to the average. Then, I rereference to linked mastoids (TP9, TP10).<span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal">When running an ICA now, I try to include all 65 channels and a window popped up saying the rank computation may be inaccurate (?). I changed the channel number from 64 to 65 and ran the analyses. All the resulting components where the
same (kind of mastoid topgraphy). I am therefore asking which electrodes I have to include for the ICA... Perhaps not the two mastoids, thus 63 channels for the ICA?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am including my code for the rereferencing here<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:forestgreen">% Get channel locations, append FCz, set as reference<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">EEG = pop_chanedit(EEG,
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'lookup'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'C:\\Program Files\\MATLAB\\eeglab13_5_4b\\plugins\\dipfit2.3\\standard_BESA\\standard-10-5-cap385.elp'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'append'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,64,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'changefield'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{65
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'labels'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'FCz'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'lookup'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'C:\\Program
Files\\MATLAB\\eeglab13_5_4b\\plugins\\dipfit2.3\\standard_BESA\\standard-10-5-cap385.elp'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'setref'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'1:65'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'FCz'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">});</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">[ALLEEG EEG] = eeg_store(ALLEEG, EEG, CURRENTSET);</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">EEG = pop_chanedit(EEG,
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'setref'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'1:65'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'FCz'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">});<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:forestgreen">% Average reference
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">EEG = pop_reref( EEG, [],</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'refloc'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,struct(</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'labels'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'FCz'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'type'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">''</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'theta'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{0},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'radius'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{0.12662},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'X'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{32.9279},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'Y'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{0},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'Z'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{78.363},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'sph_theta'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{0},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'sph_phi'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{67.208},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'sph_radius'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{85},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'urchan'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{65},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'ref'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'FCz'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">},</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'datachan'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,{0}));</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">[ALLEEG EEG CURRENTSET] = pop_newset(ALLEEG, EEG, 1,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'setname'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'average_ref'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'overwrite'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'on'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'gui'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'off'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">);
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">EEG = eeg_checkset( EEG );</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"></span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:forestgreen">% Re-reference to linked mastoids (TP9 TP10) and retain the two channels
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">EEG = pop_reref( EEG, [17 22] ,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'keepref'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'on'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">);</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">[ALLEEG EEG CURRENTSET] = pop_newset(ALLEEG, EEG, 1,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'setname'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'ref_linked_mastoids'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'overwrite'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'on'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'gui'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">,</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'off'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">);
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">[ALLEEG EEG] = eeg_store(ALLEEG, EEG, CURRENTSET);</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am looking forward to your ideas.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best, <o:p></o:p></p>
<p class="MsoNormal">Clemens <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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