AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Vincent Costa
May 12, 2006 03:55PM
Hi,

I am a bit confused about how to properly use the -stim_npr and -iresp options in 3dDeconvolve.

I have an event-related design with 64 trials, each lasting for 8 3 sec TRs.

I have a stimulus function that lasts for 513 volumes, and each trial lasts 8 TRs. So I would like -iresp to output an impulse response function for each voxel that is 8 TRs long.

e.g. 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 ...

In the manual it says that -iresp will output a timeseries that is p+1 in length. So I would think that I would need to set -stim_npr 8. But all of my stimuli are TR-locked in their presentation and I do no have subthreshold TR timepoints.

Do I need to use stim_npr and then 3dTshift ? MUCH CONFUSION! Please help!

Vinny
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Subject Author Posted

Confused about stim_nptr and iresp options

Vincent Costa May 12, 2006 03:55PM

Re: Confused about stim_nptr and iresp options

Gang Chen May 12, 2006 05:29PM