Thank you Jeff for the input, yes at last CONN workshop I heard that gCor was something different to global signal regression, and that we could use it to correct for multi-centric analyses on different scanners, but I cannot find how?

In addition, I can't seem to be able to generate QA_GCOR in my latest analyses, so I'm not really sure what are the conditions for QA_GCOR to be generated? And is this the covariate we need to regress (but it does not appear in Denoising tab since it's a QA_* variable)?

Any new on this? Does somebody know how to enable gCor regression?