Dear SPM experts,
I have questions with setting up contrasts for the longitudinal VBM.
I have two group (A,B) with two timepoints image (pre, post)
I set the contrast as [1 -1 -1 1 ] to test the interaction.(Apre, Apost, Bpre, Bpost)
Dose it mean that (Apre - Apost) - (Bpre - Bpost) ?
Thanks for your help in advance.
Best regards,
Yvonne
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