Hi All,

Using 3dDeconvolve and stim_times_IM, I'd like to set my SPMG or GAM function to be duration-modulated, but for the durations to vary across trials. I know there are options for setting your SPMG and GAM to be duration-modulated, but it seems we can only set the duration to a constant across trails (e.g. 20 seconds in the example below from 3dDeconvolve docs:

The SPMGx functions now can take an optional
(duration) argument, specifying that the primal
SPM basis functions should be convolved with
a square wave 'duration' seconds long and then
be normalized to have peak absolute value = 1;
e.g., 'SPMG3(20)' for a 20 second duration with
three basis function. [28 Apr 2009])

Is there a way to do this for SPMG or GAM? One option that is close is the combination of stim_times_IM and dmBLOCK, like so:

"*N.B.: You can also use dmBLOCK with -stim_times_IM, in which case
each time in the 'tname' file should have just ONE extra
parameter -- the duration -- married to it, as in '30:15',
meaning a block of duration 15 seconds starting at t=30 s."

But it's still not quite what I'd like.

Much thanks for any help in advance!
Anthony