<div dir="ltr"><div class="gmail_default" style="color:rgb(51,51,153)">Hello Sebastian, hope you find these brief notes below of some use. </div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">When STUDY interpolates channels it interpolates scalp channels, and that does not directly affect the ICs, though it may bring about problems in eeglab later.<br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Usually some scalp channels are dropped before ICA, and then interpolated after ICA is done already.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Consider this: either stay in ICA space (and stop caring about the scalp channels), or interpolate the channels (and stop caring about the ICs). another alternative is to use the ICA for cleaning the data, then rebuild the data without the artifactual ICs, and then interpolate the scalp channels if you need to.<br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">If I remember correctly, some parts of EEGLAB stop working when the number of scalp channels does not match the number of ICs anymore, such as after interpolating the scalp channels after you've done the ICA with less than all channels. <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 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 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 class="gmail_default" style="color:rgb(51,51,153)"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 11, 2015 at 7:29 AM, Sebastian Grissmann <span dir="ltr"><<a href="mailto:sebastian.grissmann@lead.uni-tuebingen.de" target="_blank">sebastian.grissmann@lead.uni-tuebingen.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi there,<br>
<br>
I´m running ICA before I interpolate channels in a STUDY.<br>
<br>
Now I´m wondering what happens with the channel ICs?<br>
<br>
Usually I have 1 IC per channel. When I create a study I also<br>
select ICs based on their r.v. and then interpolate channels.<br>
<br>
Does this mean that I have some channels without ICs? Does this<br>
affect my results / interpretations if I use ICs for clustering later?<br>
<br>
Best,<br>
Sebastian<br>
<br>
<br>
-- <br>
Sebastian Grissmann (Mag. rer. nat)<br>
PhD student<br>
<br>
LEAD Graduate School<br>
University of Tübingen<br>
Gartenstrasse 29 (1st floor)<br>
72074 Tübingen<br>
Germany<br>
Phone <a href="tel:%2B49%207071%2029-73579" value="+4970712973579" target="_blank">+49 7071 29-73579</a><br>
<br>
<a href="http://www.lead.uni-tuebingen.de" rel="noreferrer" target="_blank">www.lead.uni-tuebingen.de</a><br>
<br>
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