On 03/22/2013 06:45 AM, Gabriel Gonzalez Escamilla wrote:

Dear Doug,

I've seen that you restore the files to download, for the Xhemi registration. While I'm checking for the statistical process, I've seen that the one I have is: Date: 2012/12/06 16:06:52, Revision: 1.59.2.4, and the one that is on your ftp server is Date: 2012/12/06 16:06:17, Revision: 1.66, So mine is a lower version but recent hour, and the actual is newer version but seems that was created before the one I have. My question is, Which one should I keep?

Can you send me a diff of the two files?

If I change the mris_precproc version. Shall I re-run this step before statistical analyses, to create a new lh.lh-rh.thickness.sm00.mgh?

On the other hand I have some doubts about the statistical procedure. It's supposed that if I apply the Xhemi registration, as result the left and right hemispheres are equals to each other on every subject, so:

A) Where can I get the CT values after the Xhemi registration to FSaverage_sym for the left and right hemispheres?

what are CT values?

B) Given that I have two groups, Patients and Control, with two levels each, i.e male-female (Gp1male Gp1female Gp2male Gp2female Gp1maleVar1 Gp1femaleVar1 Grp2maleVar1 Grp2femaleVar1), and that I can set the contrasts and fsgd files as with a normal CT analisis, but only on my lh.lh-rh.thickness.smXX.mgh, wich is suppose to contain the left-right differences across subjects, right?

Wich would be the right interpretation? of:

The interpretation does not really change because it is a xhemi analysis

1. 5 .5 -.5 -.5 0 0 0 0

Is the L-R difference between Grp1 and Grp2 different than 0 (regressing out Var1 and gender)

2. 5 -.5 .5 -.5 0 0 0 0

Is the L-R difference between Males and Females different than 0 (regressing out Var1 and Group)

3. 0 0 0 0 .5 .5 -.5 -.5

Does the slope of the L-R difference with Var1 differ between Grp1 and Grp2(regressing out gender)

4. 0 0 0 0 5 -.5 .5 -.5

Does the slope of the L-R difference with Var1 differ between Male and Female(regressing out group)

Many thanks in advanced. Gabriel.