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

History of AFNI updates  

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July 06, 2009 10:52AM
Phoebe,

Granger causality analysis identifies connectivity based on consecutive time points (time series). What kind of experiment do you have, event-related or blocked design? Looks like more likely the former since you modeled the HRF with TENT. If you're focusing on TaskA, it's hard to tell whether you have to extract those time points relevant to TaskA or not.

There are two approaches to handling the other two tasks: (1) regressing out before extracting out those time points using 3dSynthesize; (2) extracting those regressors with the design matrix generated by 3dDeconvolve with option -xsave.

(1) is probably more favorable because you may run out of degree of freedom in Granger causality analysis.

Gang
Subject Author Posted

1dGC.R

Phoebe Chan July 05, 2009 10:56PM

Re: 1dGC.R

Gang Chen July 06, 2009 10:52AM

Re: 1dGC.R

Phoebe Chan July 06, 2009 05:43PM

Re: 1dGC.R

Gang Chen July 06, 2009 10:26PM

Re: 1dGC.R

Phoebe Chan July 08, 2009 05:02PM

Re: 1dGC.R

Gang Chen July 08, 2009 05:12PM

Re: 1dGC.R

Phoebe Chan July 09, 2009 02:00AM

Re: 1dGC.R

Gang Chen July 09, 2009 02:25PM

Re: 1dGC.R

Phoebe Chan July 09, 2009 04:17PM