afni.nimh.nih.gov

Hello,

In this case, they will not be the same. Your SA term is modeled by 2 regressors, not just 1. In such a case, the unspecified GLT will be evaluated as the sum of the components, meaning 'SYM: +SA' is the same as 'SYM: +SA[0] +SA[1]'. That sum is likely to wash out the individual components, to some degree.

If you want to compare directly, depending on which component you actually care about (likely the first), consider using something like:

-gltsym 'SYM: SA[0]' -glt_label 4 SA_0

- rick