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

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Laura
March 31, 2010 04:15PM
I am using Alphasim for group analysis and have a couple of questions. I have completed the following steps and want to make sure I am doing things correctly

1) Created a mask from the template used for @auto_tlrc
2) Ran "3dresample -dxyz 3.75 3.75 3.54" on the mask to convert the mask to the orig voxel size of the functional data
3) Estimated FWHM using 3dFWHMx on the errts+orig data and average across all subjects
4) Ran "AlphaSim -mask resamp_automask+tlrc. -iter 1000 -rmm 3.75 -pthr .001 -fwhmx 8.78 -fwhmy 6.85 -fwhmz 6.51"

The results showed that at p<.05 the cluster size should be 20 voxels. Therefore do I use 20 for vmul in the clusterize GUI? Or do I need to multiple 20 by the original resolution with was (3.75 x 3.75 x 3.54)?

Are there any changes I need to make to steps 1-4?

Thanks,
Laura
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Subject Author Posted

Alphasim Clarification

Laura March 31, 2010 04:15PM

Re: Alphasim Clarification

Phil Burton March 31, 2010 06:14PM

Re: Alphasim Clarification

Colm Connolly March 31, 2010 06:53PM

Re: Alphasim Clarification

rick reynolds April 05, 2010 02:00PM