yes, but do you want to do the fMRI analysis on the surface or in the volume? There are lots of advantages to doing it on the surface. If your sig.cluster.mgh was a surface overlay then the threholded.mgh might be exactly what you want. Load it on an inflated surface and take a look

cheers Bruce

On Mon, 25 Jan 2016, Erik Lindberg wrote:

Dear Bruce and Freesurfers,

I probably then go about this in the wrong way. My aim is to create a binary mask for regions that I found differences in - in a group-comparison. I the n want to export the mask so I can use it as seed area in an fMRI analysis.

Can this be done

Thanks Eric

Hi Erik

what is the dimensionality of sig.cluster.mgh? You can tell this with mri_info. It is problaby a surface overlay (so nvertices in one dimension), and can't be viewed in the volume but only on the surface.

cheers Bruce