You need to add the xCon structure to the SPM variable and properly fill the xCon with the correct fields. If you have an old SPM.mat file you can see what the fields should be.

If you are simple wanting to cluster and find the peaks, the SPM.mat file is not actually needed with the peak_nii.m program that I recently wrote. There is a previous post on usage of peak_nii.m. It is available for download from

Best Regards, Donald McLaren
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School
Office: (773) 406-2464
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On Thu, May 19, 2011 at 4:13 PM, Joshua Goh <[log in to unmask]> wrote:
Dear list,

I have a .img/.hdr file that consists of t-values computed externally to SPM. Is there a way I can display or use this t-map in spm_results_ui? This is so that I can apply the cluster threshold as well as spm_list to identify global and local peaks.