Hello BettyAnn,
Which 3D volumes you use to create the 4D input volume depends on what question your analysis is attempting to answer. For example if Task A and Task B performance are single pe files, then those are the files you would subtract with fslmaths and then merge the processed files together to form the randomise input.
Kind Regards
Matthew
> I would like to add to my original question:
>
> I will be doing paired t-tests where I manually subtract TaskA - TaskB via fslmaths. Does that make a difference as to what the 3D inputs should be?
>
> Thanks again,
> * ba
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