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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Kevin
December 02, 2003 11:26AM
Hi all,

I have some data that consists of 5 trials, each of which has 5 slices of functional data (265 time points per trial, TR=300ms). Since the experiment is quite basic (2 sec. visual flash, 3 times per trial), I assume that I would begin to see a bold response after averaging the 5 trials together (3dmean file_1+orig file_2+orig etc). However, I seem to be getting into trouble and think it may be due to the way in which I'm comparing my ideal.1D file to the real data. The ideal.1D file I created consists of 265 pts with '0's (rest) and '1's (activation), and then transformed it using:

waver -dt 0.3 -GAM -input ideal.1D > ideal_hrf.1D

Could I now baseline correct/detrend the data in each slice of each trial independently, and THEN average overall trials? If so, how would I do this?
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Subject Author Posted

ideal.1D

Kevin December 02, 2003 11:26AM

Re: ideal.1D

Gang Chen December 02, 2003 11:51AM

Re: ideal.1D

Kevin December 02, 2003 03:58PM

Re: ideal.1D

bob cox December 02, 2003 05:18PM

Re: ideal.1D

Kevin December 03, 2003 08:32AM

Re: ideal.1D

Matthew Belmonte December 03, 2003 07:28AM