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Dear List, I've noticed that the same image smoothed with the same FWHM kernel yields subtly different values. Comparing the code for spm_smooth.m between the two versions yields the following difference around line 95: in SPM5: x = exp(-(x).^2/(2*(s(1)).^2)); y = exp(-(y).^2/(2*(s(2)).^2)); z = exp(-(z).^2/(2*(s(3)).^2)); in SPM8: x = spm_smoothkern(s(1),x,1); y = spm_smoothkern(s(2),y,1); z = spm_smoothkern(s(3),z,1); I'm assuming that the SPM8 is the favored code at this point; just curious why it changed (i.e., although spm_smoothkern is part of the SPM5 package, it's not referenced in the SPM5 version of spm_smooth. Couldn't find an explanation in the SPM8 manual or on the list previously. Cheers! rob -- Robert J Ellis, PhD Postdoctoral Research Fellow in Neurology Beth Israel Deaconess Medical Center Harvard Medical School