[FieldTrip] source analysis: common filter

[Stan van Pelt]

Comparing the 'whole head'-sources like this sounds ok to me! Bets, Stan ----- Oorspronkelijk bericht -----
> Van: "Hanneke van Dijk" <Hanneke.vanDijk at med.uni-duesseldorf.de>
> Aan: "FieldTrip discussion list" <fieldtrip at science.ru.nl>
> Verzonden: Maandag 25 juni 2012 14:50:17
> Onderwerp: Re: [FieldTrip] source analysis: common filter
> 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 Universit ä t D ü sseldorf, 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 Universit ä t D ü sseldorf, Germany
> > > Hanneke.vanDijk at med.uni-duesseldorf.de
> > > Tel. +49 (0) 211 81 13074
> > > __________________________________________
> > > _______________________________________________
> > > fieldtrip mailing list
> > > fieldtrip at donders.ru.nl
> > > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> > --
> > 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
> > _______________________________________________
> > fieldtrip mailing list
> > fieldtrip at donders.ru.nl
> > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> _______________________________________________
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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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