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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xantossid
July 29, 2017 01:53PM
HI everyone

I would really appreciate if someone can weight on this: what is the minimum reasonable seed size for resting state fmri (seed to all brain) timeseries extraction. (I'm using HCP ICA cleaned data )
I am trying to correlate tractography findings with resting state fMRI connectivity (seed to all brain) from the thalamus . I have basically parcellated the thalamus using tractography and now I want to see if a similar antero-posterior pattern is maintained also in the cortical networks at rest . I have small masks of about 100 voxels each but when I use 3dmaskave and 3dfim+ the resulting correlation bucket requires a very low threshold of the Afni slider (around .2) to see some activation. Is that expected?

thanks a lot
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Subject Author Posted

smallest seed size fmri

xantossid July 29, 2017 01:53PM

Re: smallest seed size fmri

gang July 31, 2017 11:58AM

Re: smallest seed size fmri

xantossid July 31, 2017 03:09PM