We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:
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The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.
The rationale for dmBLOCK is that a varying duration across trials presumably leads to varying response magnitude as well as response duration. The underlying basis function is BLOCK. I'm not so sure how much difference it would make if SPMG1 is used as a basis function, but you may have to ask Bob to add such an option. Alternatively you could manually create those two regressors yourself using SPMG1.