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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Tali Ball
April 22, 2009 05:13PM
I am interested in functional connectivity in conditions A and B, and groups 1 and 2. I am looking particularly for group by condition interactions. What I did was 2 functional connectivity analyses per person (ie 2 3ddeconvolves per per person), one for each condition. I did this using a censor with timepoints of interest coded 1, all other TRs coded 0. I used all the output files with 3danova3 to look for main effects and (most importantly) interactions between condition and group.

Here are my main questions: (1) does doing the analysis this way differ significantly from Gang Chen's recommended Context-Dependent Correlation? (http://afni.nimh.nih.gov/sscc/gangc/CD-CorrAna.html) (2) What is the recommended approach to find group by condition interactions in functional connectivity?

Thanks!
~Tali
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Context-Dependent Correlation versus Simple Correlation + ANOVA

Tali Ball April 22, 2009 05:13PM

Re: Context-Dependent Correlation versus Simple Correlation + ANOVA

Gang Chen April 24, 2009 10:55AM