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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gang
January 31, 2019 01:06PM
Duong,

My opinion is that FMRI data are not suited for causal modeling through GCA and SEM considering the amount of noise and coarse temporal resolution.

> It seems to me we can only do this with resting state data. Is this right?

At least there is one less concern with the resting-state data than task-related data about the mixture of task and resting state.

> when cutting out a 'task' block, should we keep the whole block or should we remove the first 3-4 TRs of hemodynamic lag?

Instead it probably makes sense to include a few more TRs after the stimulus ends due to hemodynamic recovery phase.

Gang
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Subject Author Posted

Granger causality analysis in AFNI

Gang Chen September 05, 2008 09:58AM

Re: Granger causality analysis in AFNI

Paul Hamilton September 10, 2008 05:32PM

Re: Granger causality analysis in AFNI

Gang Chen September 10, 2008 10:00PM

Re: Granger causality analysis in AFNI

dlhuynh January 30, 2019 02:22PM

Re: Granger causality analysis in AFNI

gang January 31, 2019 01:06PM

Re: Granger causality analysis in AFNI

samw June 13, 2019 05:45PM

Re: Granger causality analysis in AFNI

gang June 19, 2019 11:48AM