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 19, 2015 06:40PM
Hi Gang,

As far as conjunction analyses are concerned, can you please comment on the two analysis pathways described below that differ in WHEN cluster-extent thresholding is implemented?

It seems to me that method 2 would be overly conservative and would presume that false positives would occur in the same voxel for tests 1 and 2. Is it really necessary to do cluster-extent thresholding after the individual voxel-wise tests? Or does one carry out that step only at the end, on the voxels that spatially overlap for test 1 AND test 2.

1. Voxel-wise thresholding for statistical test #1
2. Voxel-wise thresholding for statistical test #2
3. Identifying spatial overlap among above-threshold voxels for tests 1 and 2.
4. Cluster-wise thresholding on the spatial overlap map

OR

1. Voxel-wise thresholding for statistical test #1, followed by cluster-wise thresholding
2. Voxel-wise thresholding for statistical test #2, followed by cluster-wise thresholding
3. Identifying spatial overlap among above-threshold voxels for tests 1 and 2.
4. Cluster-wise thresholding on the spatial overlap map

Best,
Christine
Subject Author Posted

Conjunction analysis and cluster-extent thresholding

gpagnon August 26, 2014 07:10AM

Re: Conjunction analysis and cluster-extent thresholding

gang August 28, 2014 04:20PM

Re: Conjunction analysis and cluster-extent thresholding

gpagnon September 01, 2014 09:23AM

Re: Conjunction analysis and cluster-extent thresholding

gang September 02, 2014 11:56AM

Re: Conjunction analysis and cluster-extent thresholding

gpagnon September 06, 2014 03:31AM

Re: Conjunction analysis and cluster-extent thresholding

Christine Smith March 19, 2015 06:40PM

Re: Conjunction analysis and cluster-extent thresholding

gang March 20, 2015 04:50PM

Re: Conjunction analysis and cluster-extent thresholding

Christine Smith March 20, 2015 08:46PM

Re: Conjunction analysis and cluster-extent thresholding

gang March 23, 2015 03:06PM

Re: Conjunction analysis and cluster-extent thresholding

Isaac Schwabacher March 23, 2015 03:34PM

Re: Conjunction analysis and cluster-extent thresholding

rick reynolds March 23, 2015 09:50AM

Re: Conjunction analysis and cluster-extent thresholding

rick reynolds March 23, 2015 10:52AM

Re: Conjunction analysis and cluster-extent thresholding

rick reynolds March 23, 2015 01:08PM

Re: Conjunction analysis and cluster-extent thresholding

Christine Smith March 23, 2015 04:29PM

Re: Conjunction analysis and cluster-extent thresholding

rick reynolds March 24, 2015 04:05PM