Ella, Thanks for your reply. I did see that in the MarsBar FAQ, but unfortunately the solution suggested doesn't work either. When I select Design>Add/Edit Filter nothing happens on SPM (no error message, just nothing comes up). Also I wouldn't know what high-pass filter to apply if something did appear because I don't know what caused the original error.
I've been trying to do the ROI analysis manually instead. I have image files of the two ROIs exported from MarsBar. I also have participant-level contrast images of the relevant contrasts. What I want to do is use the ROI images to 'mask' in someway the contrast images so that I can get an average 'intensity' value for each ROI for each contrast. At the moment all I can do is manually take the Intensity value from each contrast for the peak voxel within each ROI (as ascertained from the original SPM analysis).
Thanks
Rob
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