Under the "Post-Stats" tab you'll see "Contrast Masking" ... That's where you would mask one cope by another, giving you the common activations. -----Original Message----- From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Carlos Silva Pereira Sent: Wednesday, February 13, 2008 7:26 AM To: [log in to unmask] Subject: [FSL] masking procedure Hello, I'm beggining to use FSL and I would like to see common activations between two conditions (and obtain an image with these activations). I was thinking of doing it using masking procedures. How do I do this and is there a better way to do it (rather than using masks)? I've tried the pre-threshold masking in Feat but it doesn't do this. Thanks. Carlos