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It performs spm_est_smoothness on a subset of the residuals.

nSres=min(nScan,MAXRES)
i_res = round(linspace(1,nScan,nSres))';        % Indices for residual
Then it takes those residual images and passes them to spm_est_smoothness.

Best Regards, Donald McLaren
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D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Mon, Nov 11, 2013 at 10:37 AM, YAN Chao-Gan <[log in to unmask]> wrote:
Hi,

Just add one more question:

How is SPM.xVol.FWHM calculated?

Perform spm_est_smoothness on the 4D residuals?

Thanks a lot!

Best,

Chao-Gan


On Tue, Nov 5, 2013 at 10:32 AM, H. Nebl <[log in to unmask]> wrote:
According to this https://github.com/ddwagner/SPM8w/blob/master/SPM8w/spm8w_alphasim.m the ResMS.img should not be used, but the  FWHM stored in SPM.xVol.FWHM .

For statistics with GLM Flex, I found a variable FWHM in I.mat. For a 2x2 within-subject ANOVA I have 4 different cells with three values each - I assume they correspond to the between-subject term, factor 1, factor 2, two-way interaction? For the given GLM Flex model the values are approx. 7 to 8 units, but I'm not sure whether they mean voxel units or mm.

Building coresponding contrasts on single-subject level and entering them into a second-level SPM one-sample t-test results in a SPM.xVol.FWHM of approx. 6 to 7 units, which is voxel units. SPM statistics output shows both voxel and mm values.


Comments are greatly appreciated!


Best,

Helmut



--
Chao-Gan YAN, Ph.D.
Research Scientist
The Nathan Kline Institute for Psychiatric Research, 140 Old Orangeburg Road, Orangeburg, NY 10962
Center for the Developing Brain, Child Mind Institute, 445 Park Avenue, New York, NY 10022
The Phyllis Green and Randolph Cowen Institute for Pediatric Neuroscience, New York University Child Study Center, New York, NY 10016
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