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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LuisaBoh
May 26, 2020 10:46AM
Hello AFNI

Im working with an emotional processing fMRI task. I am trying to run the 3dClustSim with the -acf option and the abc parameters to calculate my cluster threshold.

I already calculate the clusters sizes for 2 of my conditions (anger and fear), but I also want to calculate the anger+fear condition.

I am not sure how to calculate the ERRTS of this condition (because I don't really have a full model in this contrast) to be able to run 3dFWHM and obtain the abc parameters.

the betas of this condition (anger+fear) were calculated mixing the betas of the anger and fear contrast
3dcalc -prefix anger_fear_mean_gr_neutral_Deconvolve.nii -a Beta_anger_5mm.nii -b Beta_fear_5mm.nii -c Beta_neutral_5mm.nii -expr '(a+b)/2-c'


Can I average the abc parameters of anger and abc parameters of fear to create the abc parameters of anger+fear?

Thank you for your help
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abc parameters for 3dClustSim

LuisaBoh May 26, 2020 10:46AM