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Hi Makoto,<br>
I am trying to replicate a pipeline very precisely and this pipeline interpolates after ICA. I only wanted to remove the artefacts from the data and then convert back to channel data. If I delete the eye blink components and then convert back to raw data, -and
then delete all ICA info, such as the weights and activations etc, is it then safe for me to interpolate using the channel data (which now has blinks removed)?<br>
<br>
If I really have to avoid the situation, then how do you get around rank issues of interpolating before? I know you delete channels but how do you know how many to delete in relation to the number of channels interpolated. If possible I would like to interpolate
after, as I only need to work with the channel data after the ICA. <br>
<br>
Thank you again for your advice! Very much appreciated. <br>
Jumana <br>
------------------------------------------<br>
Jumana Ahmad<br>
Post-Doctoral Research Worker in Cognitive Neuroscience<br>
EU-AIMS Longitudinal European Autism Project (LEAP) & SynaG Study<br>
Room M1.26.Department of Forensic and Neurodevelopmental Sciences (PO 23) | Institute of Psychiatry, Psychology & Neuroscience | King’s College London | 16 De Crespigny Park | London SE5 8AF<br>
<br>
Phone: 0207 848 5359| Email: jumana.ahmad@kcl.ac.uk | Website: www.eu-aims.eu | Facebook: www.facebook.com/euaims<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Makoto Miyakoshi <mmiyakoshi@ucsd.edu><br>
<b>Sent:</b> 13 January 2017 08:05:04<br>
<b>To:</b> Ahmad, Jumana<br>
<b>Cc:</b> eeglablist@sccn.ucsd.edu<br>
<b>Subject:</b> Re: [Eeglablist] ICA, re-referencing, interpolation</font>
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<div dir="ltr">Dear Jumana,
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<div>I encountered that kind of situation many times, which is why I thought it would be a nice idea to show the exact steps in the wiki page. Now you see my point!</div>
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<div>Editing channels after ICA is DANGEROUS. There are even some phenomena that confused me to death which I still don't understand (and do not remember well any more). Some of EEGLAB's check function can detect the change of channel number difference and
inconsistency with EEG.ica-items, but not all the operations are not supported, particualy any behavior outside GUI (but the worst mysterious case I experienced was replicated even using GUI, so I guess it was like I was performing bug finding in EEGLAB, as
if several test players plays an alpha version of a computer game trying to do the weirdest things to find bugs.)</div>
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<div>So, my advice is that DO NOT EDIT CHANNELS AFTER ICA. Once the mixing matrix is confused and how it happened, you are done. Just stay away from that situation.</div>
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<div>I appreciate though you have been doing exploration! I'm glad to see that at least other guys than I experience the same issues. </div>
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<div>From Lufthansa455 to Frankfurt,</div>
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<div>Makoto</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jan 4, 2017 at 9:06 AM, Ahmad, Jumana <span dir="ltr">
<<a href="mailto:jumana.ahmad@kcl.ac.uk" target="_blank">jumana.ahmad@kcl.ac.uk</a>></span> wrote:<br>
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<p class="MsoNormal">Dear EEGLab,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I do not include noisy channels in ICA which I only do to remove eye related components, and specifically want to interpolate then after ICA for rank reasons. I have now done this to over 100 datasets.
<u></u><u></u></p>
<p class="MsoNormal">However, once I interpolate and then re-reference my data to the average, I get the error: Error: some channels not used for ICA decomposition are used for rereferencing<u></u><u></u></p>
<p class="MsoNormal"> the ICA decomposition has been removed<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">However, I purposefully wanted to interpolate these after ICA, and then use them for the average.<u></u><u></u></p>
<p class="MsoNormal">Is my eye-blink removal via ICA now affected and undone? <u>
</u><u></u></p>
<p class="MsoNormal">I would appreciate any advice.<u></u><u></u></p>
<p class="MsoNormal">Best wishes,<u></u><u></u></p>
<p class="MsoNormal">Jumana <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;color:#1f497d">------------------------------<wbr>------------</span></b><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;color:#1f497d;background:#ffee94">Jumana Ahmad</span></b><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;color:#1f497d">Post-Doctoral Research Worker in Cognitive Neuroscience </span><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="background:white"><i><span style="font-size:10.0pt;color:#1f497d">EU-AIMS Longitudinal European Autism Project (LEAP) & SynaG Study</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;color:#1f497d">Room M1.09. Department of Forensic and Neurodevelopmental Sciences (PO 23) | Institute of Psychiatry, Psychology & Neuroscience | King’s College London | 16 De Crespigny
Park | London SE5 8AF</span><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;color:#1f497d"> </span><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;color:#1f497d">Phone:</span></b><span style="font-size:10.0pt;color:#1f497d"> </span><span lang="EN-US" style="font-size:10.0pt;color:navy">0207848 0260</span><span style="font-size:10.0pt;color:#1f497d">| <b>Email:</b> <span style="background:#ffee94">jumana.ahmad</span></span><span style="color:black"><a href="mailto:antonia.sanjose@kcl.ac.uk" target="_blank"><span style="font-size:10.0pt;color:purple">@kcl.<wbr>ac.uk</span></a></span><span style="font-size:10.0pt;color:#1f497d"> | <b>Website:</b> </span><span style="color:black"><a href="https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.eu-aims.eu%2F&data=01%7C01%7Cjumana.ahmad%40kcl.ac.uk%7C283380d9389643d9653708d43b7a38bc%7C8370cf1416f34c16b83c724071654356%7C0&sdata=NdhNvFWrTx1tn28VuA31t4ZIiyIMuEoGJ2%2FR5XnRKaI%3D&reserved=0" target="_blank"><span style="font-size:10.0pt;color:purple">www.eu-aims.<wbr>eu</span></a></span><span style="font-size:10.0pt;color:#1f497d"> | <b>Facebook:</b> </span><span style="color:black"><a href="https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.facebook.com%2Feuaims&data=01%7C01%7Cjumana.ahmad%40kcl.ac.uk%7C283380d9389643d9653708d43b7a38bc%7C8370cf1416f34c16b83c724071654356%7C0&sdata=%2FCH%2FgGc5kXxLAiHkczUoYIw4SUc1pFQvcYYgWAra3Lc%3D&reserved=0" target="_blank"><span style="font-size:10.0pt;color:purple">www.facebook.<wbr>com/euaims</span></a></span><span style="font-family:"Helvetica",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#1f497d">We are currently looking for volunteers with mild intellectual disability to be part of our exciting and world-leading European project into brain development and social behaviour. Please,
do get in touch if you know of anyone who may be interested in taking part. </span>
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-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">Makoto Miyakoshi<br>
Swartz Center for Computational Neuroscience<br>
Institute for Neural Computation, University of California San Diego<br>
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