3ddeconvolve negative time handling

AFNI Message Board
1

Hi,

I’m wondering how 3ddeconvolve handles negative stim times at the beginning of the stim_time files. I have them in several files just as fillers for the ease of some programming and they shouldn’t be used. I do get a warning of something along the line of ‘unusable times’, but couldn’t find how afni actually handles those. Does afni just ignore those negative times and pair the first event in the neural data with the first positive time (which is what I want) or do something else?

Thank you!

2

Yes, those times should be ignored. You should be able to verify it by the fact that the corresponding regressors presumably start off at 0.0 at the beginning of the run (depending on the basis function).

  • rick