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
January 22, 2014 11:03AM
> How does the official spm software handle this? maybe there are some hard
> constraints how much of the temporal/spatial derivative can be added.

The three basis functions coded in option SPMG3 of 3dDeconvolve are exactly the same as implemented in the SPM. Over-fitting is the caveat that can't be easily avoided with the approach of multiple basis functions since little constraint is imposed. The issue of over-fitting aside, the fitting itself with your data seems reasonable. To see how the three components end up with the blue curve, you can plot out each of the three components and see how they look like.

Gang
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Subject Author Posted

SPMG3 model allows weird shapes?

paranoidandroid January 21, 2014 11:22AM

Re: SPMG3 model allows weird shapes?

gang January 22, 2014 11:03AM

Re: SPMG3 model allows weird shapes?

Daniel Glen January 22, 2014 12:12PM