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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John Graner
May 23, 2012 09:54AM
Hello AFNI users and makers,

I am wondering what the best way is to look for differences in IRFs between subjects and between groups. I'm estimating IRFs to a stimulus using a TENT(0,14,8) model in 3ddeconvolve. What is the best way to produce an average IRF for a group of subjects and compare that average IRF to the average IRF from another group?

Would it be appropriate to average each IRF time point's beta value (the data has previously been converted to % change from the voxel-wise mean rather than absolute intensity) across the subjects in a group to come up with a group average IRF? Would it be better to fit a curve to each subject's IRF estimate and then find average values for the curve fit parameters for the group? Is there a completely different method that is typically used?

Thanks,
-John
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Subject Author Posted

Comparing IRFs Between Groups

John Graner May 23, 2012 09:54AM

Re: Comparing IRFs Between Groups

gang May 23, 2012 02:19PM

Re: Comparing IRFs Between Groups

John Graner May 23, 2012 04:08PM

Re: Comparing IRFs Between Groups

gang May 23, 2012 04:53PM

Re: Comparing IRFs Between Groups

John May 24, 2012 10:37AM

Re: Comparing IRFs Between Groups

gang May 24, 2012 02:09PM

Re: Comparing IRFs Between Groups

John May 24, 2012 02:45PM