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 14, 2021 09:36AM
Hi!

If I would have normal fMRI-data and run a factorial 3dMVM analysis I know the steps to get "valid" cluster-corrections using the errts-files to in 3dFWHMx -ACF to generate the acf-paramters followed by simulations in 3dClustSim where you have to pick a "maximum" a per-voxel threshold of 0.002 to be able to claim that the results are false-pos corrected according to AFNI-guidelines.

But this time we have single 3D volume structural maps (from the FSL-VBM pipeline). We now want to do a 3x2 factorial analysis using 3dMVM. The analysis went fine but how do we tackle the cluster-correction question here?

Our approach, since this is not bold-data, is to use the data itself with brain-masks to get smoothness via 3dFWMHx -ShowMeClassicFWHM . We argued that we can use the old -FMHM method since this is not temporal bold-data. I.e. get the x-y-z smoothness estimates and plug them into 3dclustsim -fwhmxyz with the group-test-mask used in 3dMVM.

Would this be correct? If so, is there any "maximum" allowed per voxel p-value to use, like the 0.002 in the fMRI guidelines?

Best,
Robin
Subject Author Posted

Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

Robin September 14, 2021 09:36AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

Daniel Glen September 15, 2021 10:30AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

gang September 15, 2021 11:06AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

Peter Molfese September 15, 2021 11:50AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

Robin September 16, 2021 05:57AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

Robin September 17, 2021 07:14AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

gang September 20, 2021 10:42PM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

Robin September 23, 2021 05:16AM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

gang September 25, 2021 01:25PM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM) Attachments

Robin September 25, 2021 03:00PM

Re: Stats (e.g. 3dMVM) on anatomical data (e..g VBM)

gang September 25, 2021 09:27PM