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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Chunming Lu
September 04, 2005 10:00AM
Hi all,
Here is a question about the principle of fmri and AFNI also.
During the process of parameter estimating, do AFNI presume that all voxels’ hemodynamic response of the brain have the same distribution, and fit the hrf by the same function?
Then, there are two voxels, for example, A and B. Voxel A’s hrf are just normal as most of the cases. Voxel B’s, however, don’t. That means that the signal have an early suppression, or initial dip, which will influence the form of the hrf. This will exert some effects on the estimated results?


Thanks!

-- Chunming Lu
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Subject Author Posted

About parameter estimating

Chunming Lu September 04, 2005 10:00AM

Re: About parameter estimating

bob cox September 04, 2005 10:39AM

Re: About parameter estimating

Chunming Lu September 04, 2005 10:45PM