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

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____________________________________________
Thomas Nichols, PhD
Director, Modelling & Genetics
GlaxoSmithKline Clinical Imaging Centre

Senior Research Fellow
Oxford University FMRIB Centre