<div dir="ltr"><div class="gmail_default" style="color:rgb(51,51,153)">Hello Gregory, brief notes below. Best wishes.</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)">****************************************</div><div class="gmail_default" style="color:rgb(51,51,153)">This is an unlikely/unusual error with eeglab. I've used study a lot with 128 and 256 channel data, and it does not seem to have problems with channels when the same channel file is correctly loaded when importing the eeg into eeglab, regardless of whether the files in question have different channels dropped.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">I would recommend you look closely at the steps involved with</div><div class="gmail_default" style="color:rgb(51,51,153)">a. loading correct channel file manually (try it via gui first and confirm no errors via channel visualization tools) - </div><div class="gmail_default" style="color:rgb(51,51,153)">b. saving .set file after channel removal</div><div class="gmail_default" style="color:rgb(51,51,153)">c. any steps where you might be applying new/different labels to the 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)">If you haven't had a chance to as of yet, I recommend trying eeglab tutorial, eeglab tutorial data, reviewing eeglab wiki and eeglablist, reviewing eegh output to make sure any scripts are correct, and reviewing past similar posts on your topic.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">As a last alternative, before running study, you may want to loop through your files and interpolate the channels so that all files have the same channels, and the same channel information in the EEG structure.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Last, note that it is totally possible to do manual/visual selection of bad channels with 256 channel data, it should not take more than 10 minutes per file/session. One needs to review which channels are dropped, and whether major clusters of channels are being taken out. Further, note that with high-density montages some reasearch groups regularly drop/discount the lowest channels on the head and the channels on the face, which often tend to be most contaminated with muscle noise and/or bad signal.</div><div class="gmail_default" style="color:rgb(51,51,153)"><div class="gmail_default"><br></div><div class="gmail_default">****************************************</div></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 class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 15, 2017 at 3:53 AM, Grégory SIMON <span dir="ltr"><<a href="mailto:simon@cyceron.fr" target="_blank">simon@cyceron.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="FR" link="#0563C1" vlink="#954F72"><div class="m_-5506031479234449143WordSection1"><p class="MsoNormal"><span lang="EN-US">Dear all,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">After artifact corrections our different datasets haven’t the same number of electrodes.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">In the study panel, when we select “Precompute channel mesure” using “spherical interpolation of missing channels” we obtain sometime an error because of dissimilar files in the structures and we have the messagebox “error in function legendre at line 106”<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">An idea? Because we have 256 EEG channels, exclusion of electrodes by visual inspection is not possible.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Best regards <u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Gregory SIMON<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p></div><div id="m_-5506031479234449143DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br> <table style="border-top:1px solid #d3d4de">
<tbody><tr>
<td style="width:55px;padding-top:18px"><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank"><img src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" alt="" width="46" height="29" style="width:46px;height:29px"></a></td>
<td style="width:470px;padding-top:17px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Garanti sans virus. <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" style="color:#4453ea" target="_blank">www.avast.com</a> </td>
</tr>
</tbody></table>
<a href="#m_-5506031479234449143_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"> </a></div></div><br>______________________________<wbr>_________________<br>
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" rel="noreferrer" target="_blank">http://sccn.ucsd.edu/eeglab/<wbr>eeglabmail.html</a><br>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.<wbr>ucsd.edu</a><br>
For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.<wbr>edu</a><br></blockquote></div><br></div></div>