Hello

I have a rapid event-related design and the duration of my trials are variable. My plan is to run 3ddeconvolve on each individual trial so I can run MVPA. As I was reading over the 3ddeconvolve options, it seemed to me that the recommended options would be to use 'dmUBLOCK(1)' with -stim_times_AM2. My confusion is simple (I hope). I don't really understand what I am meant to be using as my amplitude modulation. I can't think of what I would be wanting to use other than duration, which feels redundant since I am already providing the event duration in the 1D file after a colon. I know I shouldn't use AM1, and I know to provide no modulation simply returns the script to using AM1 defaults, so I am stuck. Below is a sample of a command I might run in this example:

3dDeconvolve -force_TR 2.8 -input pb03.sub114.r02.empty+orig.HEAD -polort A -stim_times_millisec -num_stimts 1 -basis_normall 1 -float -local_times -stim_times_AM2 1 sub114_run2_trial1.1D 'dmUBLOCK(1)' -stim_label 1 trial1 -tout -fout -bucket 1_DeconResult

Thank you,
Heather