Hi Stan,<div><br></div><div>Thanks for your reply!</div><div><br></div><div>Virtual channel analysis will be a step in my analysis as well! </div><div><br></div><div>I hope I will get something sensible out of the whole head analysis though, that's (also) why I decided to use these mni_normalized grids. So to first do sourceanalysis for all sessions and conditions (--> all gridpoints are at the same positions for all subjects and sessions) and then compare the 'whole head' sources would also be valid I suppose. I then just have to live with the fact that I use different filters for the two sessions...</div>
<div><br></div><div>Groetjes!</div><div><br></div><div>Hanneke</div><div><br></div><div><p class="MsoNormal"><a name="_MailAutoSig"><span style="font-size:9.0pt">__________________________________________</span></a></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Hanneke van Dijk, PhD</span></p>
<p class="MsoNormal"><a href="http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html"><span lang="DE" style="font-size:9.0pt;color:blue">http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html</span></a><span style="font-size:9.0pt"></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Institute for Clinical Neuroscience,</span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt">__________________________________________ </span></p></div><div><br></div><div><br><br><div class="gmail_quote">On Mon, Jun 25, 2012 at 1:10 PM, Stan van Pelt <span dir="ltr"><<a href="mailto:stan.vanpelt@fcdonders.ru.nl" target="_blank">stan.vanpelt@fcdonders.ru.nl</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-size:12pt;font-family:Times New Roman"><font size="3">Hi Hanneke,</font><div style="font-size:12pt;font-family:'Times New Roman'">
<br></div><div style="font-size:12pt;font-family:'Times New Roman'">If my understanding is correct, you cannot use common filters over all sessions, exactly because of the reason you mention (different spatial relation between sensors and the head/brain). Using common filters within a session is ok of course (to look at effect of condition on a source's activity).</div>
<div><font size="3">What you could do as an alternative is compute virtual sensor time courses for the source-of-interest, separately for both sessions, and </font>subsequently<font size="3"> append these (source-level) data afterwards (and then your contrasts/statistics).</font></div>
<div><br></div><div><font size="3"></font>Hope this helps.</div><div><br></div><div>Stan</div><div><br></div><div><p class="MsoNormal"><span><span style="font-size:11.5pt;font-family:"Calibri","sans-serif"">-- </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <u></u><u></u></span></p>
<p class="MsoNormal"><span><span style="font-size:11.5pt;font-family:"Calibri","sans-serif"">Stan van Pelt, PhD</span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><u></u><u></u></span></p>
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<b>Van: </b>"Hanneke vanDijk" <<a href="mailto:Hanneke.vanDijk@med.uni-duesseldorf.de" target="_blank">Hanneke.vanDijk@med.uni-duesseldorf.de</a>><br><b>Aan: </b><a href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a><br>
<b>Verzonden: </b>Maandag 25 juni 2012 10:44:59<br><b>Onderwerp: </b>[FieldTrip] source analysis: common filter<div><div class="h5"><br><br><div><p class="MsoNormal">Dear all,</p><p class="MsoNormal"> </p><p class="MsoNormal">
Currently I am analyzing data of an experiment in which subjects perform two conditions in two sessions. They have been out of the MEG system between the sessions.</p><p class="MsoNormal"> </p><p class="MsoNormal">For sourceanalysis I am using mni-normalized headmodels and grids. This because in the two sessions the subjects are probably seated slightly differently in the MEG system. (Thus I have separate headmodels and grids for the two sessions).</p>
<p class="MsoNormal"> </p><p class="MsoNormal">Currently I am using a common filter for analyzing the two conditions <u>within </u>a session. I am wondering however if it would be (even) possible and if yes, more, or less correct to use a common filter over all conditions/sessions.</p>
<p class="MsoNormal"> </p><p class="MsoNormal">Best Regards,</p><p class="MsoNormal"> </p><p class="MsoNormal">Hanneke</p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:9.0pt">__________________________________________</span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span></p><p class="MsoNormal"><span style="font-size:9.0pt">Hanneke van Dijk, PhD</span></p><p class="MsoNormal"><span lang="DE" style="font-size:9.0pt"><a href="http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html" target="_blank"><span lang="EN-US" style="color:blue">http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html</span></a></span><span style="font-size:9.0pt"></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Institute for Clinical Neuroscience,</span></p><p class="MsoNormal"><span style="font-size:9.0pt">Heinrich Heine Universit</span><span lang="DE" style="font-size:9.0pt">ä</span><span style="font-size:9.0pt">t D</span><span lang="DE" style="font-size:9.0pt">ü</span><span style="font-size:9.0pt">sseldorf, Germany</span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"><a href="mailto:Hanneke.vanDijk@med.uni-duesseldorf.de" target="_blank">Hanneke.vanDijk@med.uni-duesseldorf.de</a></span></p><p class="MsoNormal"><span style="font-size:9.0pt">Tel. <a href="tel:%2B49%20%280%29%20211%2081%2013074" value="+492118113074" target="_blank">+49 (0) 211 81 13074</a> </span></p>
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<span class="HOEnZb"><font color="#888888"><br><br><br><font size="3">-- </font><br><div style="font-size:12pt;font-family:'Times New Roman'"><span name="x"></span>Stan van Pelt<br><br>Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen<br>
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