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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Bob Cox
March 12, 2009 04:52PM
A more basic question is, why are you using waver? It is largely obsolete now due to the incorporation of most of its features into the -stim_times options of 3dDeconvolve.

However, the purpose of waver is to create a realistic model of the hemodynamic BOLD response to neural activation. Blood changes lag behind neural changes by about 4 seconds. This is why you are getting time delays, and should also be seeing blurring in time.

Your question indicates to me that you are somewhat confused about how FMRI data analysis is structured. This is a moderately complicated subject, and hard to deal with in a message board post. Resources available on our Web site include the material we use for teaching AFNI, which you can find at

[afni.nimh.nih.gov]
[afni.nimh.nih.gov]

In particular, the afni04 and afni05 presentations comprise an outline of the basic theory and practice of FMRI time series model fitting.

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waver and hrf files

Marnie March 12, 2009 01:26PM

Re: waver and hrf files

Bob Cox March 12, 2009 04:52PM