Hi,
I would like to enter a behavioral measure as one of the co-variates in the
VBM analysis. I tried to set up the contrasts in the GLM GUI, however, I am
running into a few problems which I cannot resolve with the information
provided on the GLM tutorials and practicals. In particular, when I call GLM
GUI from the command line, I cannot change the number of groups in the EV
tab. I tried using 1 for group 1 and 2 for group 2 in the Group column, but
when I click view design I get warning that my design matrix uses
different groups, but does not contain separable EVs for different groups.
Is there a way to change the number of groups on the GUI?
In addition, when I enter the behavioral variable, should I use two EVs, one
with behavioral measure's entries for group 1 and 0 for group 2, and second
with behavioral measures for group 2 and 0 for group 1? Should these
behavioral measures be de-meaned?
Thank you for your help,
Sincerely,
Anastasia
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