Hello Anderson.
You are very patient. Thank you. Do I just run a 1-sample t-test (http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/GLM#Single-Group_Average_.28One-Sample_T-Test.29) on my subtraction image to look at the average change across sessions, if I am looking at changes regardless of intervention group?
Best wishes,
Sam.
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