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

History of AFNI updates  

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September 21, 2012 11:49AM
Hi Rick et al-

I've had a similar problem with 3dFWHMx underestimating smoothness. In my case, it seems to happen only when I use the 'detrend' option. I'm not sure whether this is a bug with detrend, or perhaps detrend is inappropriate when using data that doesn't have anatomical detail (i.e. residuals.)

Here's example output, and I'll upload some data momentarily.

3dFWHMx 1008.rest.r1.errts+tlrc;3dFWHMx -detrend -input 1008.rest.r1.errts+tlrc
++ 3dFWHMx: AFNI version=AFNI_2011_12_21_1014 (Aug 9 2012) [64-bit]
++ Authored by: The Bob
*+ WARNING: removed 276486 voxels from mask because they are constant in time
6.80059 7.0549 6.13733
++ 3dFWHMx: AFNI version=AFNI_2011_12_21_1014 (Aug 9 2012) [64-bit]
++ Authored by: The Bob
*+ WARNING: removed 276486 voxels from mask because they are constant in time
++ detrending start: 11 baseline funcs, 126 time points
++ detrending done
3.68432 3.78866 3.5248

Hope this helps isolate the issue, and look forward to guidance!

Cheers,
Josh

----------------------------------
Josh Powell
Center for Health Behavior Neuroscience
University of Kansas Medical Center
Subject Author Posted

3dFWHM and AlphaSim

Michael Amlung August 09, 2012 12:55PM

Re: 3dFWHM and AlphaSim

nick August 09, 2012 02:19PM

Re: 3dFWHM and AlphaSim

Wolfram September 18, 2012 03:05PM

Re: 3dFWHM and AlphaSim

rick reynolds September 18, 2012 08:58PM

Re: 3dFWHM and AlphaSim

Wolfram September 19, 2012 11:05AM

Re: 3dFWHM and AlphaSim

rick reynolds September 19, 2012 09:17PM

Re: 3dFWHM and AlphaSim

Laurel September 20, 2012 05:14PM

Re: 3dFWHM and AlphaSim

rick reynolds September 20, 2012 09:03PM

Re: 3dFWHM and AlphaSim

JoshPowell September 21, 2012 11:49AM

Re: 3dFWHM and AlphaSim

rick reynolds September 21, 2012 02:04PM

Re: 3dFWHM and AlphaSim

JoshPowell September 26, 2012 03:07PM

Re: 3dFWHM and AlphaSim

rick reynolds September 26, 2012 03:36PM

Re: 3dFWHM and AlphaSim

JoshPowell October 03, 2012 03:13PM

Re: 3dFWHM and AlphaSim

rick reynolds October 03, 2012 09:11PM

Re: 3dFWHM and AlphaSim

nick September 21, 2012 02:08PM

Re: 3dFWHM and AlphaSim

rick reynolds September 21, 2012 02:47PM

Re: 3dFWHM and AlphaSim

rick reynolds September 21, 2012 03:18PM

Re: 3dFWHM and AlphaSim

Wolfram September 24, 2012 10:14AM

Re: 3dFWHM and AlphaSim

rick reynolds September 25, 2012 08:35AM

Re: 3dFWHM and AlphaSim

Wanyong February 11, 2013 01:25PM