S M posted a comment on discussion Help

Hello, Background : I'm currently running a study in which I wish to examine the effects of cognitive training on brain activity across time, in pre-selected specific ROIs. I have 3 cognitive training groups and 3 timepoints (therefore 3 fMRI scans per participant that each represent a different timepoint). Problem : Using MarsBar, I am extracting parameter estimates (betas) within specific ROIs from pre-existing One T-tests done in SPM. However, when extracted, I noticed that the values change slightly...