Hi
>
> I would appreciate it if you could help me out on this, so that I know I am interpreting my data correctly!
>
> If I ran fslmaths <pre> -sub <post> <output>, did FSL construct images pre-post or post-pre?
It does what it says on the command line
pre - post
>
> if I want to extract the values out ROIs with fslmeants from the DR2 merged files (to make plots in SPSS), what do these z-values reflect? Is this connectivity during rest of this ROI with the rest of the network (e.g. DMN)? Or should I see this as activation within this region?
It's the degree of regression against the associated DR1 course (taking into account all other processes that enter into DR as spatial maps)
> Finally, I also want to correct for grey matter atrophy, so I created a voxelwise EV via feat_gm_prepare. Do I have to demean this? And yes, how should I do this, since this is a 4D file?
>
For cross-subject designs the confounds should be demeaned, you can use fslmaths for this
hth
Christian
> Thank you very much!!
>
> Best wishes
> Heidi
>
> ================================================
> Dr. Heidi Jacobs
> Postdoc researcher
> Faculty of Health, Medicine and Life Sciences
> School for Mental Health and Neurosciences
> Division Cognitive Neuropsychiatry and Clinical Neurosciences
> Alzheimer Center Limburg
> [log in to unmask]
> www.maastrichtuniversity.nl
> www.heidijacobs.nl
>
> Dr. Tanslaan 12, 6229 ET Maastricht
> P.O. Box 616, 6200 MD Maastricht, The Netherlands
> T +31 43 38 84 090 F +31 43 38 84 092
> ================================================
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