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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Shantanu
April 14, 2004 09:12AM
Hi Gang,
You are right, i am referring to the C(1) coefficient which models the linear drift. But i need that linear drift in the context of a time frame, something that i dont think AFNI i capturing. Here is some more detail,
**Input dataset - HEAD,BRIK from analyze using to3d, with correct TR value
**Want to look at data generated when no stimulus, so stim.1D is all zero.
I guess if i had chosen to convolve with an HRF, using 'waver', and specified -dt, my c(1) would be to the right time frame, but in the current setup, i dont think 3dDeconvolve is pulling the time reference from the .HEAD file. I created a bunch of HEAD/BRIK's with different TR's, and all have the same fit coefficient.
Does that sound right to you?
Thanks,
Shantanu
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Subject Author Posted

3dDeconvolve coefficients need time scaling?

Shantanu April 13, 2004 04:46PM

Re: 3dDeconvolve coefficients need time scaling?

Gang Chen April 13, 2004 05:50PM

Re: 3dDeconvolve coefficients need time scaling?

Shantanu April 14, 2004 09:12AM

Re: 3dDeconvolve coefficients need time scaling?

Gang Chen April 14, 2004 12:24PM

Re: 3dDeconvolve coefficients need time scaling?

Shantanu April 20, 2004 11:49AM