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

History of AFNI updates  

Previous Message Next Message
Message List New Topic Print View
|
Aaron Schurger
April 20, 2006 05:42PM
Hi,
I think I am experiencing a similar problem with 3dFourier. The attached plot shows data from a single run (170 TR's @ 2 sec) in an event-related design. The blue trace is the data after despiking only, and the red trace is the same data afte despiking plus 3dFourier (-lopass 0.1667 -hipass 0.0250 -retrend). I noticed that the trend that should be added back in after running 3dFourier seems quite different from the trend that is present in the raw (despiked) data. Also, if I filter the same data using a simple digitat filter (same cutoff frequencies) and then add the mean and trend back in, the waveform looks quite different. Something seems funny. Would the truncation artifact effect things in this way?
Thanks
Aaron
Reply Quote
RSS
Subject Author Posted

a weird result of 3dFourier

Meng Liang July 09, 2005 10:24AM

Re: a weird result of 3dFourier

Robert Cox July 11, 2005 09:26AM

Re: a weird result of 3dFourier

Tom July 11, 2005 01:44PM

Re: a weird result of 3dFourier

Robert Cox July 11, 2005 01:52PM

Re: a weird result of 3dFourier

Tom July 11, 2005 02:49PM

Re: a weird result of 3dFourier

Meng Liang July 11, 2005 10:11PM

Re: a weird result of 3dFourier

bob cox July 12, 2005 05:44AM

Save JPEG in graph window

bob cox July 12, 2005 05:46AM

Re: Save JPEG in graph window

Meng Liang July 13, 2005 04:38AM

another question about filtering with 3dFourier

Meng Liang July 13, 2005 03:52AM

similar problem with 3dFourier

Aaron Schurger April 20, 2006 05:42PM

Re: similar problem with 3dFourier

Vincent Costa May 18, 2006 03:44PM