<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi there,</p>
<p>thank you so much for the info! As far as I understand, I could
take both head model and source model, as well default electrode
positions from the FT templates. Would you recommend a specific
template for each category? I am uncertain as to the
(dis)advantages of each of them.</p>
<p>It seems to me, that the standard_bem head model would be a good
start, as it is based on the "colin27" canonical brain. The choice
of source model seems to depend on the estimation method one would
use, but there are several options for each. In terms of electrode
positions, one could go with the standard_1020 or standard_1005
and modify them to fit the electrode setup used in the experiment,
right?</p>
<p>Best,<br>
Jan<br>
</p>
<div class="moz-cite-prefix">Am 21.03.2022 um 10:16 schrieb
<a class="moz-txt-link-abbreviated" href="mailto:mikkelcv@drcmr.dk">mikkelcv@drcmr.dk</a>:<br>
</div>
<blockquote type="cite"
cite="mid:AM0PR10MB34434D453D319EF4196B27FFA8169@AM0PR10MB3443.EURPRD10.PROD.OUTLOOK.COM">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style>@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:10.0pt;
font-family:"Calibri",sans-serif;}a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}div.WordSection1
{page:WordSection1;}</style>
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB">Hi Jan<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB">If you are using a standard EEG layout, then it
is not problem to use a template MRI and source space
(beyond the inherent discrepancy between the template
anatomy and the actual subject’s anatomy). There is a short
tutorial on using templates for source reconstruction here:
<a
href="https://www.fieldtriptoolbox.org/template/sourcemodel/"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.fieldtriptoolbox.org/template/sourcemodel/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB">If you got FieldTrip from Git, then you already
should have a lot of templates that you can use right out of
the box. You can see them here:
<a
href="https://github.com/fieldtrip/fieldtrip/tree/master/template"
moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/fieldtrip/fieldtrip/tree/master/template</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB">The only issues is to make sure that your EEG
layout and the template MRI are in the same coordinate
system. That you can find how to do on the regular source
reconstruction tutorials, e.g.: <a
href="https://www.fieldtriptoolbox.org/tutorial/headmodel_eeg_bem/#automatic-alignment"
moz-do-not-send="true" class="moz-txt-link-freetext">
https://www.fieldtriptoolbox.org/tutorial/headmodel_eeg_bem/#automatic-alignment</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span
style="font-size:12.0pt;color:black">Fra:
</span></b><span style="font-size:12.0pt;color:black">fieldtrip
<a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip-bounces@science.ru.nl"><fieldtrip-bounces@science.ru.nl></a> på vegne af Jan
Ostrowski via fieldtrip <a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a><br>
<b>Dato: </b>mandag, 21. marts 2022 kl. 10.07<br>
<b>Til: </b><a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>
<a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a><br>
<b>Cc: </b>Jan Ostrowski <a class="moz-txt-link-rfc2396E" href="mailto:j.ostrowski@uke.de"><j.ostrowski@uke.de></a><br>
<b>Emne: </b>[FieldTrip] Using default head and source
models for source reconstruction<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt">Hi there,<br>
<br>
my name is Jan Ostrowski and I am working on crossmodal
memory. I <br>
conducted a study using a 64-Channel EEG setup, and would
like to <br>
explore the data using Fieldtrip's source reconstruction
functionality. <br>
However, due to my study design, I did not acquire
individual MRI images <br>
for solving the forward problem.<br>
<br>
I'd like to know if it is possible to use some default
templates for <br>
that, as all tutorials assume that one has MRI images to
work with. If <br>
it is possible, then what templates should I use and how
would I <br>
implement it? As in: What steps of the process described
in the <br>
tutorials could I skip?<br>
<br>
I understand that using default templates will make the
results of the <br>
source reconstruction less precise, and I am well aware
that one should <br>
be cautious when interpreting that. This is, however,
going to be an <br>
additional, exploratory analysis.<br>
<br>
Any help with this is greatly appreciated!<br>
<br>
Best,<br>
Jan Ostrowski<br>
<br>
-- <br>
Jan Ostrowski, M.Sc.<br>
Department of Systems Neuroscience<br>
University Medical Center Hamburg-Eppendorf<br>
Martinistr. 52<br>
Building W34, Room 320b<br>
D-20246 Hamburg, Germany<br>
<br>
--<br>
<br>
_____________________________________________________________________<br>
<br>
Universitätsklinikum Hamburg-Eppendorf; Körperschaft des
öffentlichen Rechts; Gerichtsstand: Hamburg | <a class="moz-txt-link-abbreviated" href="http://www.uke.de">www.uke.de</a><br>
Vorstandsmitglieder: Prof. Dr. Burkhard Göke
(Vorsitzender), Joachim Prölß, Prof. Dr. Blanche
Schwappach-Pignataro, Marya Verdel<br>
_____________________________________________________________________<br>
<br>
SAVE PAPER - THINK BEFORE PRINTING<br>
<br>
_______________________________________________<br>
fieldtrip mailing list<br>
<a
href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip"
moz-do-not-send="true" class="moz-txt-link-freetext">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br>
<a href="https://doi.org/10.1371/journal.pcbi.1002202"
moz-do-not-send="true" class="moz-txt-link-freetext">https://doi.org/10.1371/journal.pcbi.1002202</a><o:p></o:p></span></p>
</div>
</div>
</blockquote>
<pre class="moz-signature" cols="72">--
Jan Ostrowski, M.Sc.
Department of Systems Neuroscience
University Medical Center Hamburg-Eppendorf
Martinistr. 52
Building W34, Room 320b
D-20246 Hamburg, Germany</pre>
<br><div><hr style="color: #999999;" size="1"><p style="font-size: x-small; color: #999999;">Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen Rechts; Gerichtsstand: Hamburg | <a href="http://www.uke.de/">www.uke.de</a><br>Vorstandsmitglieder: Prof. Dr. Burkhard Göke (Vorsitzender), Joachim Prölß, Prof. Dr. Blanche Schwappach-Pignataro, Marya Verdel</p><hr style="color: #999999;" size="1"><p style="font-size: x-small; color: #999999;">SAVE PAPER - THINK BEFORE PRINTING</p></div></body>
</html>