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Hi, Currently these values are in voxel units (it doesn't matter for the statistical analysis if they are scaled or not). For a 1mm voxel size (the most typical image resolution) they are then also exactly the same as mm values. Otherwise, you can get mm values by multiplying by the voxel size. I'll change this in a future release so that all values are mm, as I can see that this would be more useful. All the best, Mark On 21 May 2013, at 15:18, Jake <[log in to unmask]> wrote: > Dear FSL- > > This may be a silly question (because I may not understand the analysis properly) but I was just wondering if the scalar values calculated in vertex analysis are related to the voxel size and are in mm units? I was curious in the context of reporting group difference between the means, and after briefly checking the 2011 Neuroimage paper and the boards wasn't able to easily find the answer. Is this a meaningful measure? > > Thanks in advance for your help as always, > Jake