Dear SPM people and statisticians in particular
I would like to make a correlation between brain activation inside a ROI and a behavior measurement. The problem is that the patients of the study were acquired in different place with different scanner models (multisite study).
Can I extract the betas values inside the ROI from each 1st level model and directly use them for correlation analysis or do you need to take account about the scan site? If you need so, how could I take account of the acquisition site factor in my correlation analysis?
Thank in advance
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