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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October 21, 2021 11:09AM
> When the SPMG1 function is used, ... I get the sub-briks under this names: S#0 and ​S#1. Which beta contain the effect
> of parametric modulation and which doesn't?

S#0 is the intercept while S#1 is the slope (modulation).

> When the SPMG2 function is used, ... I get the sub-briks under this names: S#0, S#1, S#2 and S#3. Which beta contain
> the effect of parametric modulation and which doesn't? Also, which beta is related with gamma variate and which beta is
> related with its derivatives?

S#0 is associated with the major component of the hemodynamic response while S#1 corresponds to the first-order derivative. S#2 and S#3 are their corresponding slope (modulation) effects.

> When I extract a contrast from my regressor (S-I = scenario - instruction), which beta is considered for the glt (S-I) regressor

If you want to obtain the contrast for the intercept, do this:

-gltsym 'SYM: S[0] -I[0]' \

You can extend this similarly to the other components.

Gang
Subject Author Posted

Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

ruben.nechifor October 20, 2021 04:24PM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

gang October 21, 2021 11:09AM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

ruben.nechifor October 27, 2021 07:31AM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

gang October 28, 2021 04:10PM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

ruben.nechifor October 29, 2021 10:01AM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

gang October 30, 2021 06:19PM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

ruben.nechifor October 31, 2021 03:13PM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

gang November 01, 2021 11:16AM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

ruben.nechifor November 01, 2021 12:59PM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

gang November 01, 2021 01:25PM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

ruben.nechifor November 02, 2021 06:11AM

Re: Order of the sub-briks saved from SPMG1/2 functions with parametric/amplitude modulation.

gang November 03, 2021 10:36PM