[FieldTrip] source analysis: common filter

[Hanneke van Dijk]

Hi Stan,

Thanks for your reply!

Virtual channel analysis will be a step in my analysis as well!

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...

Groetjes!

Hanneke

__________________________________________



Hanneke van Dijk, PhD

http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html

Institute for Clinical Neuroscience,

Heinrich Heine Universität Düsseldorf, Germany

Hanneke.vanDijk at med.uni-duesseldorf.de

Tel. +49 (0) 211 81 13074

__________________________________________




On Mon, Jun 25, 2012 at 1:10 PM, Stan van Pelt <stan.vanpelt at fcdonders.ru.nl
> wrote:

> Hi Hanneke,
>
> 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).
> What you could do as an alternative is compute virtual sensor time courses
> for the source-of-interest, separately for both sessions, and subsequently append
> these (source-level) data afterwards (and then your contrasts/statistics).
>
> Hope this helps.
>
> Stan
>
> --  ****
>
> Stan van Pelt, PhD****
>
> ** **
>
> Ernst Strüngmann Institute (ESI)****
>
> for Neuroscience in Cooperation with Max Planck Society ****
>
> Deutschordenstr. 46****
>
> 60528 Frankfurt, Germany****
>
> Website:  www.esi-frankfurt.de****
>
> E-mail:     stan.vanpelt at esi-frankfurt.de****
>
> Tel:           +49 (0)69 96769 519****
>
> Fax:          +49 (0)69 96769 555****
>
> ------------------------------
>
> *Van: *"Hanneke vanDijk" <Hanneke.vanDijk at med.uni-duesseldorf.de>
> *Aan: *fieldtrip at donders.ru.nl
> *Verzonden: *Maandag 25 juni 2012 10:44:59
> *Onderwerp: *[FieldTrip] source analysis: common filter
>
>
> Dear all,
>
>
>
> 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.
>
>
>
> 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).
>
>
>
> Currently I am using a common filter for analyzing the two conditions *within
> *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.
>
>
>
> Best Regards,
>
>
>
> Hanneke
>
>
>
> __________________________________________
>
>
>
> Hanneke van Dijk, PhD
>
>
> http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html
>
> Institute for Clinical Neuroscience,
>
> Heinrich Heine Universität Düsseldorf, Germany
>
> Hanneke.vanDijk at med.uni-duesseldorf.de
>
> Tel. +49 (0) 211 81 13074
>
> __________________________________________
>
>
>
>
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>
>
>
> --
> Stan van Pelt
>
> Donders Institute for Brain, Cognition and Behaviour, Radboud University
> Nijmegen
> Kapittelweg 29, 6525 EN Nijmegen, Netherlands
> E-mail:  stan.vanpelt at donders.ru.nl
> Website: www.ru.nl/donders/
> Phone:  (+31) (0)24 36 10981
> Fax:    (+31) (0)24 36 10989
>
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