Dear Anderson, I just wanted to update you: I re-run the skeletonisation and the correlation analysis, but the results do not change at all. The critical value for both contrasts is set to 0. Currently I don't have any clue on how to justify such an error, nor I have an alternative idea on how to run the correlation I'm interested in with a different pipeline. Every help will be warmly appreciated. Thank you for your help. Kindest regards, Eleonora Mastrorilli