Great--thank you very much.

So, based on what you indicated, here is my 3dDeconvolve script:

3dDeconvolve -input impexpall+orig -mask impexpallMask+orig -polort 1 \
-num_stimts 1 \
-stim_times 1 Tstart_PictOrNo.txt 'BLOCK(3,1)' \
-iresp 1 PictOrNo.iresp \
-tout -fout \
-xsave \
-cbucket impexpAllDeconvolveCoeffs \
-bucket impexpAllDeconvolve

Whereby Tstart_PictOrNo.txt = Column of numbers representing time since start of run.
For the 'BLOCK' options, I chose d = 3 (which is the duration of the stimuli) and p = 1 (based on what I gathered from the weblink you provided).

Is this correct?

Thanks again for your help.

Jatin



Gang Chen wrote:

> Each event in your design lasts 3 seconds, e.g., 1.5 TR's. Your
> stimulus coding would not work. There are a couple of solutions
> to coding your stimuli. You can use -stim_file combined with
> -stim_nptr in 3dDeconvolve. Read the manual about the details
> of -stim_nptr.
>
> Or use -stim_times by providing the stimulus beginning time of
> each event in file tname with the following format:
>
> -stim_times k tname 'BLOCK(d,p)'
>
> Read the following link for instructions:
>
> http://afni.nimh.nih.gov/afni/doc/misc/3dDeconvolveSummer2004/
>
> Gang