Dear FSL experts,
When I run melodic I get the stage 2 outputs for each component, but each 4D image file for the components has always one more image than the number of subjects in the analysis. Can anyone please tell me what is the additional image and if I can use this output for second level analyses?
I also have an additional question: if one wants to compare group A vs B, can you run Melodic on each group separately, pick the components that you think match best, and then do second level analysis? I know it is more conservative and preferable to do the first step as a whole group, but I am just wondering if the bias for the second attempt is too large to make any valid inferences.
Best regards,
George
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