That contrast is correct. If you run mri_glmfit-sim, it will extract the data for each subject and cluster and save it in a text file in the contrast directory. It is better to do it this way instead of mapping the ROIs back to the individual. Look at mri_glmfit-sim --help doug
On 07/16/2012 12:52 PM, Jacobs H (NP) wrote:
Hi Doug,
Thanks for your reply. Both scores are on the same scale (z-transformed). But I would like to see whether there is a differential effect on cortical thickness. Do you think the contrast I defined was correct? And do I understand it correctly that what you suggest is the following: warp the clusters to individual space and extract the values for SPSS (or excel)?
Thanks! Heidi ________________________________________ Van: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] namens Douglas N Greve [greve@nmr.mgh.harvard.edu] Verzonden: maandag 16 juli 2012 18:17 Aan: freesurfer@nmr.mgh.harvard.edu Onderwerp: Re: [Freesurfer] Repost: fsgd file
Hi Heidi, how exactly do you want to draw a conclusion? The slopes for the different variables may be very different because the variables have a different scale. tksurfer scatter plot is made to look at a cortical variable vs a continuous variable. If you want to look at a scatter plot of your continuous variables, why not just do it in matlab or excel? doug
On 07/16/2012 04:47 AM, Jacobs H (NP) wrote:
Dear FreeSurfers,
I hope you can help me out with a problem in coding my fsgd file. I want to examine the spatial difference between two cognitive measures on cortical thickness in one group. Furthermore, I will correct for age (centered covariate). So, I have 4 variables: group (class), 2 cognitive scores (continuous) and age (continuous). How can I compare two continuous variables? I have tried to list them as two variables in the fsgd (so not class): e.g: Input101 group 2.3 1.9 -0.5 (number of subject / group / score 1/ score 2/ age) Then I ran the dods model with the contrast 0 -1 1 0, which ended up with a surface sig file. However, when I look at the scatterplot in tksurfer, I cannot see the two cognitive variables at the same time. Is there a better way to do this?
Thanks a zillion times :)
Best wishes
Heidi
================================================ Dr. Heidi Jacobs Postdoc researcher Faculty of Health, Medicine and Life Sciences School for Mental Health and Neurosciences Division Cognitive Neuropsychiatry and Clinical Neurosciences Alzheimer Center Limburg h.jacobs@maastrichtuniversity.nl www.maastrichtuniversity.nl www.heidijacobs.nl
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