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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ziad
January 06, 2014 10:07AM
Hi Nic,

The program estimates the delay between each voxel time series and the reference time series you used. The references you compare have slightly differing shapes but most importantly, have different time offset.
Since the program looks for positive delays, I suggest you do the following. Start from a square wave that starts a couple of TRs earlier than your actual stimulus timing square wave, convolve it as you did with 3dDeconvolve to get a more hemodynamic looking function, then use that function in the 3ddelay program. I don't quite see a point in using a square wave even if others have used it before.

cheers,
Ziad
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Subject Author Posted

reference time series for 3ddelay

nic January 05, 2014 01:53PM

Re: reference time series for 3ddelay

ziad January 06, 2014 10:07AM