Yes, that SA[0] GLT should be identical to the first parameter results the come by default. That was just to verify that the GLTs are not doing anything special.

To get a comparison that is more like the F-test for the SA terms, then 'SYM: SA[0] \ SA[1]' might be reasonable. That is a 2-line contrast for those two parameters (\ is used as a line separator), testing more whether either one is significant. But again, you probably already have an F-stat that corresponds with original term (or maybe not, since there does not seem to be any -fout in the 3dDeconvolve command).

Note that something like an F-test might not help so much here, assuming you will use single subject betas for a group analysis. Maybe it would be good to consider the 2-line contrast applied at the group level, instead.

- rick