Dear FS Experts,

I have followed the steps for doing a Repeated Measures ANOVA 2x2 in Freesurfer https://surfer.nmr.mgh.harvard.edu/fswiki/RepeatedMeasuresAnova

also following the previous post: https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2012-October/026287.html.

I have already created the FSGD File (2 groups: experimental and control group) and 2 times (pre-treatment and post-treatment) (I send it attached), and specified the contrasts of the model:

Tp1vsTp2Gr.Exp > 0 0 1 0

Tp1vsTp2Gr.Control > 0 0 0 -1

Interaction Effect > 0 0 1 -1

Are these contrasts correct?

I have runned the mri_preproc command, and the "lh.thickness.mgh" file has been created.

However, when I run the next step, the smoothing, an error message appears "ERROR: Option lh.thickness.mgh unknown". Am I doing something wrong?

The smoothing is an optional step, therefore, I run the mri_glmfit, (I send attached the mri_glmfit.log file), and what appears in the terminal is the file "Results_ANOVA2x2".

I this file "Results_ANOVA 2x2" two lines appear:
0 Tp1vsTp2.GrExp 0 0.740532
1 Tp1vsTp2.GrControl 0 0.672022

The first one is telling us that the cortical thickness in the experimental group was Tp1>Tp2, and the same for the control group?

Where can I find the interaction results?

Thank you for the help,

Maria.