[FieldTrip] source analysis: common filter
Stan van Pelt
stan.vanpelt at fcdonders.ru.nl
Mon Jun 25 13:10:00 CEST 2012
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 ----- Oorspronkelijk bericht -----
> 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 van Dijk, PhD
> 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
-- 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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