Hi Zhengchen,
That is right, the timing does not need to be rounded, so using the 0.1 s resolution sounds good.
Yes, there will not be much difference between BLOCK(0.2,1) and BLOCK(1,1), though the peak of the latter will be close to that 0.8 s difference.
What is a typical range of durations?
That is right, if the median duration is about 0.2s, using dmUBLOCK(-0.2) would be reasonable, but it could also be -0.2000173. Personally, I tend to round the time. It look nicer, and it does not have to change every time you add a subject. Either way seems okay.
Note that those times (e.g., 0.2 in dmUBLOCK(-0.2)) should be constant across subjects.
- rick
