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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Peter Molfese
July 30, 2018 11:26AM
Hi Mariana-

You can use either 3dTcorr1D or 3dttest++ (or if you want to go super old school, 3dRegAna).

If you want to use 3dTcorr1D, you can follow instructions here.

If you'd prefer to use 3dttest++, then you can follow the instructions here.

The nuance of 3dttest++ is to then use 3dcalc to convert the t-value to a correlation via the t to R-square method. 

3dcalc -a T-stat+tlrc -expr ‘(ispositive(a)-isnegative(a))*sqrt(a*a/(a*a+DF))’ -prefix corr

The two programs will provide identical results, it's ultimately about what you're most comfortable using. If you have a series of behavioral measures, you'll need to do either of these processes in a loop, but you can use column selectors to grab the correct variable to correlate with the MRI data. 3dttest++ will figure out the matching data file, whereas 3dTcorr1D, the MRI and behavioral data must be in the same order.
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Simple brain - behavior correlation

mterrateixeira July 30, 2018 10:42AM

Re: Simple brain - behavior correlation

Peter Molfese July 30, 2018 11:26AM