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
December 28, 2008 08:10AM
My personal opinion is that this whole PPI business is not something delicate enough for strong inference anyway. As you've already noticed, the impulse response varies probably quite a lot across the brain and across conditions/tasks. Furthermore, deconvolution (e.g., what 3dTfitter does) can't guarantee you a robust and faithful recovery of the stimulus timing.

Having said that, you may consider experimenting different impulse response functions by fine-tuning the parameters of the gamma function in waver. Type "waver -help" to see those options.

Gang
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Subject Author Posted

waver for 3dTfitter

jinny December 25, 2008 06:02PM

Re: waver for 3dTfitter

jinny December 26, 2008 04:30PM

Re: waver for 3dTfitter

Gang Chen December 28, 2008 08:10AM