Hi Donald,
Can I just check what option in the fsl GLM GUI you could pick for the PSY variables in a gPPI set-up?
The options are: 'Min', 'Centre' and 'Mean'...
Your reply in this thread makes it sound like 'mean' centering should only be for the PHYS (seed region) variable, and the single PPI version, you would pick 'Center' for the PSY variable, but wasn't sure if this also applied for a gPP?
Many thanks in advance for your help!!
Lucia
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