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It might be good to use the -stim_times format for when the
stimuli occur, and to use BLOCK(T) for the basis functions,
where T is the duration of the given stimulus type.`
See Bob's notes from 2004 for details on using BLOCK():
Note that unless all stimulus types have durations over 15
seconds, you will not want to specify a 'p' term for the
magnitude (peak) of each regressor in BLOCK(d,p). Just use
the BLOCK(d) format.