yesand yes
doug
On 11/30/2012 10:53 AM, Alexandra Tanner wrote:
> Hi Doug,
>
> So if I run a group analysis with each contrast separately, would I then
> be running mri_concat to do a conjunction of the group sig maps? Also, can
> I merge more than 2 contrasts at once when using mri_concat? Thanks
Hi Doug,
So if I run a group analysis with each contrast separately, would I then
be running mri_concat to do a conjunction of the group sig maps? Also, can
I merge more than 2 contrasts at once when using mri_concat? Thanks!
Alex
>
> Hi Alex, unfortunately, you cannot compute a conjunction with
Hi Alex, unfortunately, you cannot compute a conjunction with the CES.
That's the problem with trying to do group-wise multi-variate analysis.
Another thing you can do is to do a group analysis with each contrast
separately, then do a conjunction of the group sig maps.
doug
On 11/29/2012 03:39
Thanks for the clarification! So I will rerun mergecontrasts-sess using
the ces image on my subjects and then run mri_vol2surf and mri_concat to
get the group map. Thanks for your help!
Best,
Alex
> Usually the contrast effects size (ces) (in SPM this is the CON image,
> in FSL it is the COPE ima
Usually the contrast effects size (ces) (in SPM this is the CON image,
in FSL it is the COPE image). Univariate maps are usually passed up to
the group level (the conjunction done with mergecontrasts is multivariate).
doug
On 11/29/2012 01:05 PM, Alexandra Tanner wrote:
> Hi Doug,
>
> Thanks fo
Hi Doug,
Thanks for the response! Just out of curiosity, what map is typically used
for group analyses? Should I have used a map other than sig on the
individual subject level as well?
Thanks!
Alex
>
> You'll have to run mri_vol2surf on each one separately to bring it into
> the fsaverage spac
You'll have to run mri_vol2surf on each one separately to bring it into
the fsaverage space, then mri_concat to stack all of the maps into one
file. At that point you can compute a mean (also with mri_concat).
Generally, one does not do group analysis on sig maps though.
doug
On 11/27/2012 05
Hi Doug and Freesurfers,
I recently used mergecontrasts-sess to merge two contrasts of an analysis
in 50 different subjects. The command ran on each subject individually and
created a sig.nii and sig.ovpl file within a merged contrast folder for
each subject. I'd now like to look at an average map
