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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rick reynolds
October 14, 2019 09:50PM
Hello,

When the motion parameters are evaluated for censoring, the first difference of the 6 parameters is applied, before taking the Euclidean norm (sqrt(sum squares)), giving the enorm file. So that is based on the different between adjacent time points.

The max motion displacement is a similar number, but it is between ANY pair of time points (before or after censoring). A very slow displacement drift will have low enorm values (first diff is always small), but the max difference could end up being large.

See also: gen_ss_review_scripts.py -help_fields

Does that seem reasonable?

- rick
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Subject Author Posted

Max motion displacement vs Motion limit

MeganQ October 14, 2019 01:30PM

Re: Max motion displacement vs Motion limit

rick reynolds October 14, 2019 09:50PM

Re: Max motion displacement vs Motion limit

MeganQ October 15, 2019 08:09AM