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Re: What would make a suitable highpass parameter for preprocesing for a VOI dump

Author: Jim Bjork (---.net.nih.gov)
Date: 11-06-09 09:17

Hi Jim,

That's actually what I originally did (using -Iresp with 3dDeconvolve), but it was later suggested to me that maybe this wasn't such a good idea, in that the dumped out responses spill over into other modeled task events, although their timing is jittered. Of course, this would be a problem with mapfile averaging too.

When I flirted around in 3dDeconvolve with different values (i.e. durations) for the -stim_maxlag, the shape and peak of the -iresp-derived HRF dumps was very sensitive to the stim_maxlag setting- instead of just giving me more data at later time points, so it leaves me wondering what the "truth" is.

Maybe I can't handle the truth!

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