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Ok thanks this is clear. Marco On 21 November 2012 22:29, Martin Dietz <[log in to unmask]> wrote: > Hi Marco, > > If your goal is to compare conditions across different data sets from the same subject, you should merge them and then compute the forward model. You can then choose the set of conditions to invert together. > > If you are using the SPM template for the head model, the leadfield matrix will already be in the /canonical/ subdirectory. If on the other hand you are using individual structural MRIs, you will have to build the head model, coregister and compute the forward model again. > > I hope this is clear > > Martin > > On 21 Nov 2012, at 18:06, "Marco Buiatti" <[log in to unmask]> wrote: > >> Thanks for your reply, but my problem is that the first step of my >> analysis is to select data per condition from an eeglab format and >> then do source reconstruction. >> >> So I guess the question is: can I copy the head model from one spm >> dataset to another (containing another subset of trials belonging to >> the same subject)? >> >> Thanks, >> >> Marco >> >> On 21 November 2012 16:24, Martin Dietz <[log in to unmask]> wrote: >>> Dear Marco, >>> >>> Once you have computed and saved the forward model a given subject (e.g. BEM >>> for EEG), you can invert another set of conditions/trials under 'Invert' in >>> the GUI or 'M/EEG source inversion' in the batch. Either way, you have the >>> option of inverting all conditions together or only only a subset of >>> conditions by providing the condition label. >>> >>> Best wishes >>> Martin >>> >>> >>> >>> On 21 Nov2012, at 3:51 PM, Marco Buiatti wrote: >>> >>> Dear Vladimir, >>> >>> I have EEG data for which I have computed the head-modeling for source >>> reconstruction. >>> >>> Now I would like to compute the source reconstruction on another >>> condition (another set of trials) of the same subject, but I would >>> like to avoid re-doing the head-modelling bit. How can I do? In your >>> reply below you say that it's possible to save it. What should I save >>> exactly and how can I reintegrate it in the new set of trials? >>> >>> Thanks, >>> >>> Marco >>> >>> On 23 February 2012 16:17, Vladimir Litvak <[log in to unmask]> >>> wrote: >>> >>> Dear Davide, >>> >>> >>> If you use individual MRIs you must create the head models >>> >>> individually. If you have individual fiducials then you must also do >>> >>> the coregistration individually. If you also choose the forward model >>> >>> and save it you can then run group inversions repeatedly on these >>> >>> datasets without having to re-do the head-modelling bit. If you want >>> >>> to script everything you can use the batch tool for creating head >>> >>> models to create a batch and do 'Save as..' to save it as an .m file. >>> >>> You can then modify the batch inputs with your own code and re-run. >>> >>> This is not M/EEG-specific there must be a lot of explanations about >>> >>> that if you search in the list archives. >>> >>> >>> Best, >>> >>> >>> Vladimir >>> >>> >>> On Thu, Feb 23, 2012 at 2:48 PM, Rivolta, Davide >>> >>> <[log in to unmask]> wrote: >>> >>> Dear all, >>> >>> >>> >>> >>> Is there a documentation (apart from the manual) that explains how to >>> >>> perform the “group inversion”? >>> >>> >>> >>> >>> For example, do I need to perform the co-registration, Forward model and >>> >>> Invert resolution for each subject (and each condition) individually and >>> >>> then, somehow, average the results, OR there is a quicker way (I am thinking >>> >>> at group inversion) to run all these steps at once? >>> >>> >>> >>> >>> I am using individual MRI. >>> >>> >>> >>> >>> Thanks, >>> >>> >>> Davide >>> >>> >>> >>> >>> >>> >>> -- >>> Marco Buiatti, PhD >>> >>> CEA/DSV/I2BM / NeuroSpin >>> INSERM U992 - Cognitive Neuroimaging Unit >>> Bât 145 - Point Courrier 156 >>> Gif sur Yvette F-91191 FRANCE >>> Ph: +33(0)169.08.65.21 >>> Fax: +33(0)169.08.79.73 >>> E-mail: [log in to unmask] >>> http://www.unicog.org/pm/pmwiki.php/Main/MarcoBuiatti >>> >>> *********************************************** >> >> >> >> -- >> Marco Buiatti, PhD >> >> CEA/DSV/I2BM / NeuroSpin >> INSERM U992 - Cognitive Neuroimaging Unit >> Bât 145 - Point Courrier 156 >> Gif sur Yvette F-91191 FRANCE >> Ph: +33(0)169.08.65.21 >> Fax: +33(0)169.08.79.73 >> E-mail: [log in to unmask] >> http://www.unicog.org/pm/pmwiki.php/Main/MarcoBuiatti >> >> *********************************************** -- Marco Buiatti, PhD CEA/DSV/I2BM / NeuroSpin INSERM U992 - Cognitive Neuroimaging Unit Bât 145 - Point Courrier 156 Gif sur Yvette F-91191 FRANCE Ph: +33(0)169.08.65.21 Fax: +33(0)169.08.79.73 E-mail: [log in to unmask] http://www.unicog.org/pm/pmwiki.php/Main/MarcoBuiatti ***********************************************