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
July 02, 2015 12:24PM
Hi Janina,

Here is an older post and thread on the subject:
"Re: Censoring Resting State Data"

1) The enorm value is an L2 norm (sqrt(sum sq)), while
FD is an L1 norm (sum abs). While that difference
is small, L1 does not make sense to me. A motion
difference of "6 0 0 0 0 0" is a far bigger motion than
"1 1 1 1 1 1", yet they would be the "same" with FD
(same, subject to slight scaling of rotation terms).

2) The enorm measure pre-dates FD, and it seems
more appropriate.

- rick
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Subject Author Posted

censor_motion vs Framewise Displacement (FD)

janina_aletheia July 02, 2015 12:06PM

Re: censor_motion vs Framewise Displacement (FD)

rick reynolds July 02, 2015 12:24PM

Re: censor_motion vs Framewise Displacement (FD)

janina_aletheia July 03, 2015 05:16AM

Re: censor_motion vs Framewise Displacement (FD)

rick reynolds July 06, 2015 02:13PM

Re: censor_motion vs Framewise Displacement (FD)

janina_aletheia July 07, 2015 11:14AM