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
February 28, 2021 07:57PM
> What is the GLT output when I'm not specifying the basis function? Does it combine the two basis functions (and how does it do it?)?

If you don't specify the basis function index, 3dDeconvolve gives you the sum of those two regression coefficients, which would not make much sense.

> Which one should I use for the group analyses if I want to compare the first basis function and the combination between the first
> basis function and the derivative (t test with permutations)?

There are two possibilities. You can focus on the first basis function and ignore the second, which seems to be the norm in the SPM-land:

-gltsym 'SYM: S[0]'

Or, you can adopt an omnibus approach:

-gltsym 'SYM: S[0] \ S[1]'

which is the same as

-gltsym 'SYM: S[[0..1]]'

See more details here: [afni.nimh.nih.gov]

Gang



Edited 1 time(s). Last edit at 03/01/2021 06:56AM by Gang.
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Subject Author Posted

SPMG2 GLT outputs

ruben.nechifor February 26, 2021 01:09PM

Re: SPMG2 GLT outputs

gang February 28, 2021 07:57PM

Re: SPMG2 GLT outputs

ruben.nechifor March 01, 2021 05:49AM

Re: SPMG2 GLT outputs

gang March 01, 2021 10:17PM