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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June 06, 2022 12:53PM
In order to model this, there really must be a baseline condition. Otherwise there is no distinction between "equally active for all tasks" and "dead salmon" - we can only evaluate contrasts.

In your case, it is not really possible to get separate beta weights for all 3 conditions. One of them must be considered as a baseline, to which the others could be compared. The 3 possible basic contrasts (A-B, A-C, B-C) would then simplify (A-B, A, B), were condition C to taken as the baseline.

Does this seem reasonable?

- rick
Subject Author Posted

3dDeconvolve baseline question

mworden June 06, 2022 11:53AM

Re: 3dDeconvolve baseline question

rick reynolds June 06, 2022 12:53PM

Re: 3dDeconvolve baseline question

mworden June 06, 2022 02:57PM

Re: 3dDeconvolve baseline question

rick reynolds June 06, 2022 03:08PM