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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AjaySK
January 26, 2017 12:36AM
Hi Afni Experts,
I wanted to get your thoughts on the use of the use of grand mean scaling as it pertains to resting state fMRI and ALFF. From a paper from Calhoun and colleagues (http://inc.ucsd.edu/ica2001/075-calhoun.pdf) it seems that grand scaling is needed in resting state to account for gain which can change session to session. However, in previous posts it seems to hint that this step is needed in task-fMRI but not necessarily resting state fMRI since seed based analyses rely on shape profile as opposed to amplitude for correlation analysis. What are you current thoughts on this matter?

As it pertains to ALFF and mALFF, do you see this as a necessary step or could it introduce other unforeseen errors?

Thanks
Ajay
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ALFF/Resting state preprocessing - grand mean scaling

AjaySK January 26, 2017 12:36AM

Re: ALFF/Resting state preprocessing - grand mean scaling

ptaylor January 26, 2017 03:43PM