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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 ================= 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 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. 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 > - > Initiating + Service Node > The R-fMRI Network (RFMRI.ORG) > *http://rfmri.org/yan <http://rfmri.org/yan>* > http://scholar.google.com/citations?user=lJQ9B58AAAAJ&hl=en >