Dear SPMers,
I used gPPI to address between group differences in connectivity and found an interaction effect (for a contrast: (condition a > condition b). Now to further explore the interaction effect (that means to disentangle whether the interaction effect is driven by differences in condition a or b) is it valid to extract parameter estimates, %-signal change respectively from the underlying conditions? And does this mean I have to re-run the connectivity analysis for the contrasts condition a > implicit baseline and condition b > implicit baseline to generate the appropriate con-images for further extraction?
Thanks in advance & best regards
Ben
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