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Dear FSL users Using fslmaths, I want run a formula, using files that go into the "stats" directory, which are generated from a first level analysis. The files that end up in this directory are cope; neff; pe; tstat; varcope and zstat. The formula is very simple - merely multiplying one of the contrasts by a number and subtracting another number. What I'm not sure about is which contrast files will go into the formula? The cope; neff; pe; tstat; varcope or zstat files? All of them? I have tried using the cope, tstat and zstat files in the formula, but when I run a Fixed Effects analysis (averaging across runs), it will not create thresholded zstat files for the new files that I have created using fslmaths. I'm not able to set this formula up using the FSL GUI when doing the first level analyses, which is why I am having to resort to this formula subsequently. Thanks, Liam. -- Liam J Nestor PhD