[FieldTrip] Using default head and source models for source reconstruction

[Jan Ostrowski]

Hi there,

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.

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?

Best,
Jan

Am 21.03.2022 um 10:16 schrieb mikkelcv at drcmr.dk:
>
> Hi Jan
>
> 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: 
> https://www.fieldtriptoolbox.org/template/sourcemodel/
>
> 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: https://github.com/fieldtrip/fieldtrip/tree/master/template
>
> 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.: 
> https://www.fieldtriptoolbox.org/tutorial/headmodel_eeg_bem/#automatic-alignment
>
> Best regards
>
> *Fra: *fieldtrip <fieldtrip-bounces at science.ru.nl> på vegne af Jan 
> Ostrowski via fieldtrip <fieldtrip at science.ru.nl>
> *Dato: *mandag, 21. marts 2022 kl. 10.07
> *Til: *fieldtrip at science.ru.nl <fieldtrip at science.ru.nl>
> *Cc: *Jan Ostrowski <j.ostrowski at uke.de>
> *Emne: *[FieldTrip] Using default head and source models for source 
> reconstruction
>
> Hi there,
>
> my name is Jan Ostrowski and I am working on crossmodal memory. I
> conducted a study using a 64-Channel EEG setup, and would like to
> explore the data using Fieldtrip's source reconstruction functionality.
> However, due to my study design, I did not acquire individual MRI images
> for solving the forward problem.
>
> I'd like to know if it is possible to use some default templates for
> that, as all tutorials assume that one has MRI images to work with. If
> it is possible, then what templates should I use and how would I
> implement it? As in: What steps of the process described in the
> tutorials could I skip?
>
> I understand that using default templates will make the results of the
> source reconstruction less precise, and I am well aware that one should
> be cautious when interpreting that. This is, however, going to be an
> additional, exploratory analysis.
>
> Any help with this is greatly appreciated!
>
> Best,
> Jan Ostrowski
>
> -- 
> Jan Ostrowski, M.Sc.
> Department of Systems Neuroscience
> University Medical Center Hamburg-Eppendorf
> Martinistr. 52
> Building W34, Room 320b
> D-20246 Hamburg, Germany
>
> --
>
> _____________________________________________________________________
>
> Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen 
> Rechts; Gerichtsstand: Hamburg | www.uke.de
> Vorstandsmitglieder: Prof. Dr. Burkhard Göke (Vorsitzender), Joachim 
> Prölß, Prof. Dr. Blanche Schwappach-Pignataro, Marya Verdel
> _____________________________________________________________________
>
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> https://doi.org/10.1371/journal.pcbi.1002202
>
-- 
Jan Ostrowski, M.Sc.
Department of Systems Neuroscience
University Medical Center Hamburg-Eppendorf
Martinistr. 52
Building W34, Room 320b
D-20246 Hamburg, Germany
--

_____________________________________________________________________

Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen Rechts; Gerichtsstand: Hamburg | www.uke.de
Vorstandsmitglieder: Prof. Dr. Burkhard Göke (Vorsitzender), Joachim Prölß, Prof. Dr. Blanche Schwappach-Pignataro, Marya Verdel
_____________________________________________________________________

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