We are looking at different 'd' values for the BLOCK(d,p) function in our amplitude modulated regression using 3ddeconvolve. It is unclear whether we expect to see a brief peak of activation or sustained activation post-stimulus since we are looking at subjects response to a predicted reward value.

I am running 3dDeconvolve with the option "-polort A" for which it recommends a value of 3 for a concatenated dataset made up of 4 runs. I am using "-stim_times_AM2" for 6 regressors. I wanted to confirm that what I am seeing in the .x1D file is what I think it is. In this case, with a polort value of 3 and 4 concatenated runs, columns [0-15] deal with the baseline. And column 16 is the non-AM convolved regressor for the first stimulus regressor, which is the output of 'BLOCK(d,p)', in this case 'BLOCK(2,1)'.

I just want to be clear and ask is this the direct output of the BLOCK(d,p) function with the dummy-coded (non-AM) regressor ? And column 17 is the AM convolved regressor (with the mean amplitude subtracted)?

Thanks in Advance,
Gabe