Hi,
I am having trouble troubleshooting an issue with my design matrix.
I specified my 1st level analysis, which includes 2 conditions (let's call them condition A and B) and 1 parametric modulator for condition A.
I also have several nuisance regressors (i.e. motion parameters). For each regressor, there are 4 sessions.
The first session in the design matrix looks good. However, for the 2nd, 3rd, and 4th session, the first three regressors are missing and labelled as "not uniquely specified." I looked into the spm.mat file (specifically SPM.xX.nKX) and found that these non unique regressors were all set to 0's (in . However, in the model specification these regressors were all set with actual values.
I am trying to figure out why these regressors (and in particular some, but not all) got set to 0 during the translation from the model specification to the design matrix.
Any suggestions or advice would be appreciated.
Thank you,
Sincerely,
Brandon Ashinoff
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