It should be the case that the clusters in the 2.3 should be clusters in the 1.3, but there p-values will be different. It is possible that a cluster that is sig in the 2.3 is not sig in the 1.3, particularly small clusters like the two you have shown. Small clusters may be very likely at 1.3 under chance conditions.
doug Rafa x wrote: > Dear Freesurfers, > > I have performed a permutation test with the command: > > mri_glmfit-sim --glmdir rh.fsgd_subj_gauss005 --sim mc-z 10000 > THRESHOLD csd --sim-sign pos --seed 1297708255 > > And after that I have obtained the clusters with: > > mri_surfcluster --subject CNTRL_MCI_RAFA_average –mask > rh.fsgd_subj_gauss005/mask.mgh --sum > rh.fsgd_subj_gauss005/contrast/clustsum.txt --in > rh.fsgd_subj_gauss005/contrast/sig.mgh --cwsig > rh.fsgd_subj_gauss005/contrast/cwsig.mgh --vwsig > rh.fsgd_subj_gauss005/contrast/vwsig.mgh --sign pos --csd > rh.fsgd_subj_gauss005/csd/csd.j001-contrast.csd > > > I’ve did it over the same dataset but with two different thresholds, > THRESHOLD: 2.301 (pvalue=0.005) and 1.301 (pvalue=0.05). As far I know > the cwsig.mgh resulting using the 1.3 threshold should be similar than > the cwsig.mgh from the second thr, but with a more restrictive > significative clusters (some coloured areas should disappear, in other > words, clusters returned in the first case should be included in > clusters returned by the 1.3 threshold). My results didn’t show that > behaviour, some of the cwsig clusters can be contained in the other, > but others don’t (see attached Figure). It is my reasoning correct? If > so, why the images mismatching? > > Thank you all in advance. > Rafa. > > > ------------------------------------------------------------------------ > > > ------------------------------------------------------------------------ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
