Your answers were already very helpfull, thank you very much.
Their was one thing I'm not very sure about.
>easiest is to use randomise on the full set of maps (after collecting
>these into a single 4D file using fslmerge -t). You can then test for
>within or between group effects using a design matrix (which you can
>create using Glm - or GLM_gui on the mac) and a contrast matrix (dito)
to do the fslmerge, do I first have to split all the melodic_ICA files, save
the right components and merge these? Because I get these errors trying this.
** ERROR (nifti_image_read): failed to find header file for '*'
** ERROR: nifti_image_open(*): bad header info
Error: failed to open file *
Cannot open volume * for reading!
And then I like to kwnow wich algorithm is used to do the ICA
Thank you very much for helping me