<div dir="ltr"><div class="gmail_default" style="color:rgb(51,51,153)">Hello Erika, here are some 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)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">******************begin notes for Erika</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">This is an unusual error that does not occur regularly especially if the files meet eeglab's requirements.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">The most likely reasons for this is are as follows (based on the error message you are getting)</div><div class="gmail_default" style="color:rgb(51,51,153)">1. individual datasets are not the same number of channels</div><div class="gmail_default" style="color:rgb(51,51,153)">2. average re-referencing scheme was not run exactly the same way for each individual dataset before concatenation</div><div class="gmail_default" style="color:rgb(51,51,153)">3. some issue with selecting 63 channels instead of 64 (assuming there are 64 channels in the concatenated data sets)</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Here are some extra notes to follow up on that should help you sort out the issue:</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Check whether you get the error when you "select" 64 rather than 63 channels. </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 are selecting 63 channels for a specific reason, consider providing more details for more suggestions. Note that things usually work better (to reduce rank if you have average-referenced the data) if you do not "reduce via the PCA flag" but rather drop a channel after rereferencing.</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 yet, use the eeglab tutorial files and attempt to concatenate and run ICA in the same way. Confirm that you do or don't get the same error.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">It is unusual to have 64 full clean channels, and this makes me thing that perhaps you have replaced bad channels. See the eeglab tutorial, makoto's pipeline, and past eeglablist posts for recommendations against interpolating channels before ICA. Overall, you should probably be dropping the same channels for each single-subject's single-session data.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Double-check to make sure that the single-subject datasets you are concatenating are from the same single-subject and that they have been cleaned/processed in the same manner.<br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Please follow up with the list when/if you get to a solution, as this will help other eeglab users benefit from your experiences.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">******************end notes for Erika<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 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, Dec 20, 2017 at 8:28 AM, Erika Nyhus <span dir="ltr"><<a href="mailto:enyhus@bowdoin.edu" target="_blank">enyhus@bowdoin.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font face="arial, helvetica, sans-serif" color="#000000">I am getting the following error when I run ICA on a concatenated datasets and selecting 63 of 64 channels<span style="white-space:pre-wrap">.</span> When I run ICA on any of the datasets individually I do not get an error. I was wondering if anyone has run in to this problem and how they were able to solve it.</font><div><font face="arial, helvetica, sans-serif" color="#000000"><br></font></div><div><font color="#000000" face="arial, helvetica, sans-serif">eeg_checkset error: number of elements in 'icachansind' (64) </font></div><div><font color="#000000" face="arial, helvetica, sans-serif">does not match the number of columns in the sphere array (63)</font></div><span class="HOEnZb"><font color="#888888"><div><font color="#000000" face="arial, helvetica, sans-serif"><br></font></div><div>-- <br><div class="m_-5261556925031466252gmail_signature"><div dir="ltr"><div><div>
Erika Nyhus, Ph.D.<br>Department of Psychology and Program in Neuroscience<div>6900 College Station</div><div>Bowdoin College</div><div>Brunswick, ME 04011<br></div><p><span style="font-size:13pt"></span></p>
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