Dear Christian and John,
I am conducting a correlation study between Grey Matter volume and a behaviour variable with 30 healthy participant. With the same data (and confounds), I have conducted the VBM processing through the CAT12 pipeline (as explain in the manual) and with the classical SPM12-DARTEL pipeline as explain in the John Ashburner tutorial (https://www.fil.ion.ucl.ac.uk/~john/misc/VBMclass15.pdf).
The results of these two pipelines give me a different result (significant TFCE corrected cluster in the frontal pole of the CAT12 processing and no significant cluster at all in classical SPM-DARTEL pipeline).
I know that the segmentation procedure as slightly different but is it the only reasons why the two results are different?
Can you help me to know which result is the most trustful regarding to my initial question (does the change of my behavioural variable correlate with GM volume)?
Thank you very much in advance
Note: I have used CAT12.5 (r1264), SPM12 (v6906), TFCE toolbox (174).
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