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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear José,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’ve forwarded your email to the FieldTrip email discussion list, since this is a more appropriate forum for a question like this (more experts=more
potential answers).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">10-50pT is way too strong to be a brain signal I’m afraid. Typical range would be 10-100 fT for CTF data, so your signal is more than 2 orders
of magnitude higher. I think it is most likely noise coming from outside the scanner (room).
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regarding the use of ft_databrowser, this is nicely decribed in the following tutorial:
<a href="http://www.fieldtriptoolbox.org/tutorial/visual_artifact_rejection#use_ft_databrowser_to_mark_the_artifacts_manually">
http://www.fieldtriptoolbox.org/tutorial/visual_artifact_rejection#use_ft_databrowser_to_mark_the_artifacts_manually</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Scaling will be done automatically if you only plot the MEG-channels. So you do not need to specify cfg.megscale (or cfg.eogscale, for that matter).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Stan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> joseluisblues@gmail.com [mailto:joseluisblues@gmail.com]
<b>On Behalf Of </b>José Luis<br>
<b>Sent:</b> vrijdag 21 oktober 2016 12:30<br>
<b>To:</b> Pelt, S. van (Stan)<br>
<b>Subject:</b> CTF MEG issue<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dear Stan Van Pelt,<br>
<br>
I found your post in the Fieldtrip list and I thought you could help with an issue I have with my CTF MEG data,<br>
<br>
I have analysed this data for an ERF study with a home-made software a few years ago. Now I am re-analysing this data to investigate oscillatory activity,<br>
<br>
I usually never pay attention to the range of my raw data since I will always end up with averages values of ERFs around the typical 10-30 fT range. However, looking now to my raw data I find it on the range of 10000 - 50000 fT. My guess is that this should
be Ok, since ERFs are always smaller in size relative to the raw data. I would like to check this with someone that has CTF MEG data.<br>
<br>
Second, since is not in the typical range I have the issue of visualizing my data with ft_databrowser. So the typical setting with:<br>
<br>
cfg.alim = 1e-12; <br>
cfg.megscale = 1;<br>
cfg.eogscale = 5e-8;<o:p></o:p></p>
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<p class="MsoNormal">doesn't work for me,<o:p></o:p></p>
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I would like to know how do you manage to visualize your data,<br>
<br>
Many thanks in advance,<br>
<br>
By the way, the link to your paper "Higher-level processes in the formation and application of associations during action understanding" is not working properly,<br>
<br>
Jose<br clear="all">
<br>
-- <o:p></o:p></p>
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<p class="MsoNormal">José Luis ULLOA FULGERI, PhD<br>
+32477429007<br>
+32492646477<br>
<a href="https://sites.google.com/site/joseluisulloafulgeri/" target="_blank">https://sites.google.com/site/joseluisulloafulgeri/</a><o:p></o:p></p>
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