<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear FieldTrip community, <div class=""><br class=""></div><div class="">I am following the pipeline of the <a href="http://www.fieldtriptoolbox.org/tutorial/beamformingextended/#loading-of-the-data" class="">http://www.fieldtriptoolbox.org/tutorial/beamformingextended/#loading-of-the-data</a> tutorial to source localise EEG activity that is coherent with muscle/EMG channels. I have a pre-computed leadfield (using simbio), which does not include the muscle channels that I want to use. </div><div class=""><br class=""></div><div class="">When attempting to run ft_sourceanalysis, I receive the following error message: </div><div class=""><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(160, 32, 240);" class=""><span style="color: #000000" class=""><br class=""></span></div><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(160, 32, 240);" class=""><span style="color: #000000" class="">Error </span>using<span style="color: #000000" class=""> </span>ft_sourceanalysis<span style="color: #000000" class=""> </span>(line 542)</div><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(160, 32, 240);" class=""><span style="color: #000000" class="">There's a </span>mismatch<span style="color: #000000" class=""> </span>between<span style="color: #000000" class=""> </span>the<span style="color: #000000" class=""> </span>number/order<span style="color: #000000" class=""> </span>of<span style="color: #000000" class=""> </span>channels<span style="color: #000000" class=""> </span>in<span style="color: #000000" class=""> </span>the<span style="color: #000000" class=""> </span>data<span style="color: #000000" class="">, </span></div><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(160, 32, 240);" class=""><span style="color: #000000" class="">with </span>respect<span style="color: #000000" class=""> </span>to<span style="color: #000000" class=""> </span>the<span style="color: #000000" class=""> </span>channels<span style="color: #000000" class=""> </span>in<span style="color: #000000" class=""> </span>the<span style="color: #000000" class=""> </span>precomputed<span style="color: #000000" class=""> </span>leadfield/filter.</div><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(160, 32, 240);" class=""><span style="color: #000000" class="">This </span>is<span style="color: #000000" class=""> </span>not<span style="color: #000000" class=""> </span>easy<span style="color: #000000" class=""> </span>to<span style="color: #000000" class=""> </span>solve<span style="color: #000000" class=""> </span>automatically.<span style="color: #000000" class=""> </span>Please<span style="color: #000000" class=""> </span>look<span style="color: #000000" class=""> </span>into<span style="color: #000000" class=""> </span>this.</div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: Courier; min-height: 14px;" class=""><br class=""></div></div><div class="">Is there a way of solving this post hoc? I am not sure which information is required in which part of the leadfield structure. I saw that in the tutorial data set, there are more sensors in the data set than included in the forward model and wonder whether it is just a matter of adding the additional channels “somehow” in the forward model? </div><div class=""><br class=""></div><div class="">Also, not having interpolated bad channels and hence having a different number of channels in the EEG data set, at what point can I control the numbering/order of the actual channels in the source reconstruction procedure? </div><div class=""><br class=""></div><div class="">Thanks a lot for your support. </div><div class="">Best, </div><div class="">Kirstin</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>