Thanks very much Doug. Mariam. On 1 Apr 2014, at 17:17, Douglas N Greve <gr...@nmr.mgh.harvard.edu> wrote:
> > If I could not reanalyze the data, I would just follow the standard process. > doug > > On 04/01/2014 04:12 AM, Mariam Sood wrote: >> Hi Doug, >> Thank you for your advice. Would you also have any advice on what would be >> the correct process to follow if volume based smoothing at subject >> level(4mm) and surface based smoothing at group level(4mm) are applied? >> Many thanks, >> Mariam. >> >> >> On 31 Mar 2014, at 16:36, Douglas N Greve <gr...@nmr.mgh.harvard.edu> wrote: >> >>> On 03/31/2014 10:05 AM, Mariam Sood wrote: >>>> Hi Doug, >>>> >>>> I have a few queries regarding FWHM used in multiple comparisons >>>> correction program mri_glmfit-sim >>>> >>>> My data at present is analysed in FSL & Freesurfer following the procedure >>>> in the link >>>> http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/FslFeatFreeSurfer. No >>>> volume based smoothing at single subject level (in FSL) is done at the >>>> moment, and a 4 mm surface level smoothing was applied during mris_preproc >>>> stage. >>>> >>>> 1. I have noticed that mri_glmfit computed a FWHM of 8.578114 using >>>> residuals. How exactly is this value computed? >>> It is based on the correlation coefficient of the residuals of adjacent >>> vertices. >>>> 2. I understand that the cached simulation used in mri_glmfit-sim is >>>> selected based on the above computed smoothness value. Is this fine, or >>>> should I override? If I also smooth the data at the single subject level >>>> on the volume (in FSL), can I still follow the above process? >>> Do you mean over-ride because you smoothed at 4 but get 8.5? No, you >>> would use the 8.5. If you smoothed in the volume, depending on how much, >>> it is probably ok to continue the process (though technically not correct) >>> doug >>>> Many thanks, >>>> Mariam. >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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: https://gate.nmr.mgh.harvard.edu/filedrop2 >>> www.nmr.mgh.harvard.edu/facility/filedrop/index.html >>> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ >>> >>> _______________________________________________ >>> 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. >>> >> >> _______________________________________________ >> 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: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
