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 Chen
March 24, 2005 10:26AM
> I'm wondering how this changes when I use a polort of 3?
> Do I still take p_0 coefficent of each run (subbricks 0, 4, 8
> and 12) and use the same expr?

If you are using the most recent version of AFNI, you don't need to worry about the other coefficients in your percent signal change calculation. The reason is that the Legendre polynomials are used in the current version of 3dDeconvolve, and they are well-centered in the sense that the area-under-the-curve is 0 for all polynomials except the constant as can be seen in the following figure.

> is all of this correct in the first place considering I use a
> wavered canonical?

It seems fine to me.
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polort and %cs

Clare March 24, 2005 09:12AM

Re: polort and %cs

Gang Chen March 24, 2005 10:26AM

Re: polort and %cs

Clare March 24, 2005 11:06AM