External Email - Use Caution Thanks, Doug! Best, Pedro.
On Sun, 9 Jun 2019 at 04:31 Greve, Douglas N.,Ph.D. <dgr...@mgh.harvard.edu> wrote: > This is a question about the biology. I.e., when you include mean > thickness as a covariate, you are then measuring the difference between > groups subtracting out the mean thickness of each individual. By using a > hemisphere specific value, you might introduce (or remove) > cross-hemispheric effects. > > On 6/8/2019 11:33 PM, Pedro Rosa wrote: > > External Email - Use Caution > > Dear all, > I read previous threads on the list concerning the use of 'total measures' > (e.g., mean thickness, total brain volune, total area) as covariates in > FreeSurfer's group analysis > Given that FreeSurfer analyses brain hemispheres separately, would it make > more sense to use hemispheric values (i.e., lh total area in the lh area > analysis and rh total area in rh area analysis) than the mean cortical > value (e.g., mean between lh and rh total area in both lh and rh analyses)? > Best, > Pedro. > > _______________________________________________ > Freesurfer mailing > listfreesur...@nmr.mgh.harvard.eduhttps://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
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