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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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Many thanks Rick and Isaac for your comments. I'm amazed by how many things have already been implemented in AFNI.
As for the statistical analysis, do you think the one I proposed is sound? This relates to another confusing point in the paper: Although their wGBC and uGBC statistical models should be almost identifical, tables 3 and 4 (uGBC results) show T-statistics, although the thresh
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afniuser
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AFNI Message Board
Hi AFNI users,
I would like to reproduce results published in Cole et al., NeuroImage 2010, in which the authors tried to identify the brain's most globally connected voxels.
The basic idea is the following: for each voxel, compute the wGBC score, which is the average of correlations of the given voxel with all other gray matter voxels. Identify as the most connected voxels those with
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afniuser
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AFNI Message Board
Thanks Rick. I've tried to do a little bit more research and have discovered actually quite a few articles about resting-state connectivity in which they plot t-statistic maps instead of mean z-transformed correlations, e.g.
- Greicius et al. 2003 Functional connectivity in the resting brain: a network analysis of the default mode hypothesis; or
- Schwarz et al. 2013 Anti-correlated cortic
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afniuser
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AFNI Message Board
I was given a script created by an ex-colleague for performing a seed correlation analysis of resting-state fMRI data. However, after comparing it to the Simple Correlation tutorial on the AFNI website (here), I'm not sure if I understand it correctly and would therefore like to double-check with you.
My input: individual subject time series (preprocessed: registration, normalization, nui
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afniuser
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AFNI Message Board