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Yvonne, Set-level inference is not available in FSL, I suspect because it is rarely used (people usually require inference on *where* there is an activation). That said, you can use the inferences provided in FSL to make such a summary measure. For example, the minimum corrected P-value (either voxel-wise or cluster-wise) is a summary of the strength of activation that you could use to compare different statistic images. -Tom On Fri, Mar 14, 2008 at 8:36 AM, Yvonne Brehmer <[log in to unmask]> wrote: > Dear Experts, > > I would like to compare two groups in their overall activity level > independent of brain region. I guess that the set-level is the > correspondent > level to look at in SPM. How can I get this information in FSL? > > Thanks for your help, > Yvonne > > -- ____________________________________________ Thomas Nichols, PhD Director, Modelling & Genetics GlaxoSmithKline Clinical Imaging Centre Senior Research Fellow Oxford University FMRIB Centre