Hello,
I'm trying to write a stimulus file for a fast, event related experiment. I have 3 different compound trial types that have different durations. Trial type I has a duration of 6TRs, trial type II has a duration of 3TRS, and Trial type III has a duration of 1 TR.
When generating the stimulus file to be used in 3dDeconvolve (in which I am specifying each TR of the experiment), do I need to code a '1' for each TR that a trial type is occuring, or just put a "1" indicating the start of that trial type? I'm worried that by just coding for the start of the trial that the fixation baseline will be mis-sampled.
For example, if I have trial type I (6TRs) followed by 2TRs of fixation, followed by trial type II (2TRs), should my stimulus file look like A or B:

A:

Trial type I Trial type II Trial type III
1 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 1 0
0 0 0


B:

Trial type1 Trial type II Trial type III
1 0 0
1 0 0
1 0 0
1 0 0
1 0 0
1 0 0
0 0 0
0 0 0
0 1 0
0 1 0


Thanks in advance,
Chuck