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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March 26, 2015 11:49AM
Basically, I am doing the following steps in separate scripts to conduct a beta-series context dependent correlation analysis:

1) 3dDecon with IM option to get individual regressors for each condition

2) Extract betas from conditions of interest to create a beta file using 3dbucket
-This creates a separate file for betas of interest for each trial (e.g., ConditionA_betas.nii)

3) Extract and de-mean betas from a seed region using 3dmaskave and 1d_tool.py
-So for example, I created an FFA seed that contains the trial-by-trial betas for Condition A (e.g., Seed_ConditionaA_betas.1D)

4) Use 3drefit -TR 2 on "ConditionA_betas.nii" from Step 2, to make it seem as though it is a 3d+time file (although it is not technically).

5) 3dfim + -input ConditionA_betas.nii -polort 2 -ideal_file Seed_ConditionaA_betas.1D -out Correlation -bucket ConditionA_BetaSeries.nii
-Supposed to create a correlation map of the Seed region with the rest of the brain corresponding to ConditionA

6) I would then Z-score this and take it to a group level analysis (e.g., 3dtest++).

Looking at the individual subject outputs from the above step seem somewhat reasonable (i.e., strong correlation surrounding voxels from seed region). Although the group-level is not making sense: within "ConditionA", the seed robustly correlates positively with just about every voxel in the brain...

-Danny
Subject Author Posted

3dfim+ Ideal File

Danny March 25, 2015 05:28PM

Re: 3dfim+ Ideal File

rick reynolds March 26, 2015 09:03AM

Re: 3dfim+ Ideal File

Danny March 26, 2015 10:28AM

Re: 3dfim+ Ideal File

rick reynolds March 26, 2015 11:12AM

Re: 3dfim+ Ideal File

Danny March 26, 2015 11:49AM

Re: 3dfim+ Ideal File

rick reynolds March 26, 2015 12:38PM

Re: 3dfim+ Ideal File

Danny March 26, 2015 12:55PM

Re: 3dfim+ Ideal File

rick reynolds March 26, 2015 03:00PM

Re: 3dfim+ Ideal File

Danny March 26, 2015 04:10PM

Re: 3dfim+ Ideal File

rick reynolds March 26, 2015 04:33PM

Re: 3dfim+ Ideal File

Danny March 27, 2015 12:24PM