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<p style="margin-top:0;margin-bottom:0">Thanks for the reply.</p>
<p style="margin-top:0;margin-bottom:0">Many of the researchers in good journal papers rely on visual examination to eliminate bad channels.</p>
<p style="margin-top:0;margin-bottom:0">That's a good technique in itself for an experienced EEG researcher.</p>
<p style="margin-top:0;margin-bottom:0">On the other hand, if I talk about ASR, from your inputs, I believe the better approach would be:</p>
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<li><span style="font-size: 12pt;"></span>Save a copy of EEG data say it origEEG.</li><li>Run ASR on EEG.</li><li>See what channels ASR has removed using EEG.etc command (call them bad channels).</li><li>Remove all the non-EOG bad channels from the origEEG manually and interpolate them.</li><li>Perform further analysis using origEEG.</li></ol>
<div>This way we saved EOG channels and removed all the non-EOG bad channels as well.</div>
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<div>Thanks,</div>
<div>Akshay</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Tarik S Bel-Bahar <tarikbelbahar@gmail.com><br>
<b>Sent:</b> Tuesday, October 23, 2018 1:52:52 AM<br>
<b>To:</b> akshayksharma94@live.com<br>
<b>Cc:</b> eeglablist<br>
<b>Subject:</b> Re: [Eeglablist] How to save EOG channels from ASR processing?</font>
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<div class="x_gmail_default" style="color:#333399">Hello Akshay, brief notes below, best wishes.</div>
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<div class="x_gmail_default" style="color:#333399">EOG channels are not necessary to keep in for ICA, as frontal EEG channels usually pick up blink ICs easily with out the EOG channels.</div>
<div class="x_gmail_default" style="color:#333399">Different researchers have different opinions, needs, and biases. Best to rely on high-quality ICA-EEG research papers to decide whether or not you need to retain the EOG channels.</div>
<div class="x_gmail_default" style="color:#333399">However, you may be needing the EOG channels for some EOG-related analyses you are doing.</div>
<div class="x_gmail_default" style="color:#333399">The method you describe should work ok. However, note that ASR may include the EOG channels in determining what the bad channels are,</div>
<div class="x_gmail_default" style="color:#333399">and if you feed it data without the EOG channels, the ASR method may give you different results (test it out to be sure, at different thresholds and with/without EOG chans).</div>
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<div class="x_gmail_default" style="color:#333399">ASR is one method to remove channels, but be careful it can be too intense (depending n the thresholds you set), or may not fit your study's requirements.</div>
<div class="x_gmail_default" style="color:#333399">When you can, try to understand the EEG data well enough so that you can determine what the bad channels are yourself by eye.</div>
<div class="x_gmail_default" style="color:#333399">Note also that there are other methods for bad channel detection in the EEGLAB gui (near the ASR option in the eeglab menu).</div>
<div class="x_gmail_default" style="color:#333399">Also, remember that Makoto's pipeline recommendations are just (useful) recommendations, and they are meant to orient beginners working with EEGLAB.</div>
<div class="x_gmail_default" style="color:#333399">Overall, it is important to be able to develop your own pipeline, for good reasons, and ideally using methods from high-quality published EEG papers to guide your decisions.</div>
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