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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Gang Chen
May 12, 2006 05:29PM
> I have an event-related design with 64 trials, each lasting for 8 3 sec TRs.

Each stimulus lasts 8 TR's? I'm confused: Would it be a block design?

> 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 ...

How are you modeling the HRF's? Can you paste the 3dDeconvolve script?

> 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.

-stim_nptr is useful only if you have event onset times locked with fractions of a TR.

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

Doesn't sound to me you need such a setup.

Gang
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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