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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ptaylor
March 10, 2021 10:23AM
Hi, Jenna-

Sorry for missing this the first time through.

Setting motion thresholds---balancing the removal problematic time points with still having a useful amount of data---is tricky. Indeed, in a number of populations, some thresholds are set higher. It will still be good to verify that motion artifacts are not overwhelming effects on correlation---hopefully reviewing the APQC HTML will help with that.

Re. correlation matrix: are you using 3dNetCorr? When you analyze the errts, then mean of that time series is 0, and within a subject those 0s match across a whole volume. The correlation values should not be strongly affected by that.

A 0 in a correlation matrix would mean that the average time series for all voxels in an ROI are identically 0. That shouldn't really happen, if the ROI is within the brain mask.

--pt
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Motion censoring in resting state for older adult/AD sample Attachments

jkblujus February 04, 2021 06:35PM

Re: Motion censoring in resting state for older adult/AD sample

ptaylor March 10, 2021 10:23AM