Our group has been making paradigm files in which stimulus onset time is
always a multiple of the TR (e.g. 0;2;4;8;10;12;16) even though, as a
result of jitter in our stimulus presentation program, the actual stimulus
onset time may be off by a couple hundred milliseconds (e.g.
.08;2.13;4.21;7.82;10.02;12.30;15.86). I recently noticed this sentence in
the freesurfer wiki: "The onset time does not need to be a multiple of the
TR or linked in any way (e.g., the onset time could be something like
11.340)." Would it be preferable if we were to alter our stimulus onset
column to reflect actual rather than intended stimulus onset time, or does
the relatively low temporal resolution make it a moot point?
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