<div dir="ltr"><div class="gmail_default" style="color:#333399">Hello Akshay, not sure if you have received a response about your query. brief notes below:</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">You rereferencing scheme should include only electrodes catching brain signal, and not EOG. </div><div class="gmail_default" style="color:#333399">Include the EOG only if you have a good clear reason for doing so based on high-quality published ICA-EEG articles.</div><div class="gmail_default" style="color:#333399">Note also that it is usual to not interpolate before average referencing, and to not interpolate before ICA.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Oct 23, 2018 at 3:24 AM Akshay Kumar <<a href="mailto:akshayksharma94@live.com">akshayksharma94@live.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Hi,</p>
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This question has been discussed previously as well at:</p>
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<a href="https://sccn.ucsd.edu/pipermail/eeglablist/2012/004650.html" class="m_8346670433830188751OWAAutoLink" id="m_8346670433830188751LPlnk744387" target="_blank">https://sccn.ucsd.edu/pipermail/eeglablist/2012/004650.html</a></p>
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however, no concrete conclusion has been made.</p>
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This is my EEG processing pipeline:</p>
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<li><span style="font-size:12pt"></span>Do downsampling, bad channel rejection and interpolation</li><li>Re-reference data to average</li><li>Create -1000 to 2000 ms epochs and remove baseline</li><li>Reject outliers based on the absolute amplitude and variance</li><li>Use ICA to remove eye and muscle artifacts</li></ol>
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No research paper, explicitly mention that in their pipeline if they included EOG channels while average referencing or not.</div>
<div id="m_8346670433830188751divtagdefaultwrapper" dir="ltr">In my opinion, if I include EOG channels while average referencing, </div>
<div id="m_8346670433830188751divtagdefaultwrapper" dir="ltr">eye movement, saccades artifacts along with other EOG electrode movement artifacts will be introduced in all channels including the occipital channel. ICA may or may not be able to remove them. </div>
<div id="m_8346670433830188751divtagdefaultwrapper" dir="ltr">If I exclude <span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols;font-size:16px">
EOG channels while average referencing</span>, EEG and EOG channels will be left with different referencing that itself is bad for ICA.</div>
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<div id="m_8346670433830188751divtagdefaultwrapper" dir="ltr">Please advise if and <span>why include/ exclude EOG channels while average referencing</span>.</div>
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<div id="m_8346670433830188751divtagdefaultwrapper" dir="ltr">Thanks,</div>
<div id="m_8346670433830188751divtagdefaultwrapper" dir="ltr">Akshay Kumar</div>
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<a id="m_8346670433830188751LPUrlAnchor_15402780995370.7042584150564013" href="https://sccn.ucsd.edu/pipermail/eeglablist/2012/004650.html" style="text-decoration:none" target="_blank">[Eeglablist] Should Average Reference Include Eye Channels?</a></div>
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<a href="http://sccn.ucsd.edu" target="_blank">sccn.ucsd.edu</a></div>
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Thank you very much Joe. I've copied and pasted critical sentences from your message to organize my response. "I definitely wouldn't drop the EOG channels until after you've dealt with the EOG artifacts in whatever manner."</div>
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