Hi Greta
I recommend you go through the standard SPM pre-processing pipeline to get your images into MNI space, and then concatenate the onsets of your trials when specifying the GLM. You can use the spm_fmri_concatenate.m script to help with this last stage - https://en.wikibooks.org/wiki/SPM/Concatenation .
Best
Peter
-----Original Message-----
From: SPM (Statistical Parametric Mapping) <[log in to unmask]> On Behalf Of Greta Todorova
Sent: 22 March 2019 15:55
To: [log in to unmask]
Subject: [SPM] sessions on multiple days and DCM
Hi SPM community.
I am analysing a data where the paradigm has 4 runs and 2 sessions i.e. On two separate days there were 4 runs; in total 8. I have a T1 anatomical for each of the sessions (days). At the pre-processing stage, I am unclear how to concatenate the 2 sessions (days) so that to end up with one continuous timeline to analyse it later with the GLM and the DCM.
I know that you can concatenate the runs into one continuous time series already at the slice-timing correction point, and then model the separate runs as regressors (one less than the actual number of runs). However, I can not figure out how to align the two sessions (days) so that at the preprocessing stage the functional and anatomical images are aligned and I can use one anatomical for the rest of the pre-processing.
It was suggested to me that I can coregister the 2 anatomical scans where I keep the one from the first session (day) as the reference image, the one from the 2nd session(day) as the source and take the functional images of the second session to be kept with the source image, and then to coregister all functional scans (from both sessions) to the 1st anatomical. As I am fairly new to SPM, I am not entirely sure if that's the right way to go about it.
Any insights will be appreciated.
Thanks,
Greta
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