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  

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Kara
May 19, 2005 06:48PM
Hi Gang,

> The problem for your numbers is this. 2500 for run 3 is
> troublesome becuase the signal value of 2450 for Task A is
> below the baseline value of 2500: Do you have a real
> deactivation? Of course that would give you "negative" percent
> signal change.

I suppose I have a "deactivation" to Task A when compared to Task B (which it is alternating with in run 3), but the same signal value of 2450 would be an "activation" when Task A is compared to fixation (which it is alternating with in run 1).
That's why I wasn't sure if it was a good idea to concatenate the runs and analyze them together.

I know these numbers are just for example, but it is possible to have a situation like this - where the same value falls above baseline in one run and below baseline in another depending on how the baseline is calculated.

Kara
Subject Author Posted

3dDeconvolve, concatenating runs with different baselines

Kara May 17, 2005 09:32AM

Re: 3dDeconvolve, concatenating runs with different baselines

Gang Chen May 17, 2005 05:23PM

Re: 3dDeconvolve, concatenating runs with different baselines

Kara May 18, 2005 08:39AM

Re: 3dDeconvolve, concatenating runs with different baselines

Gang Chen May 19, 2005 11:50AM

Re: 3dDeconvolve, concatenating runs with different baselines

Kara May 19, 2005 01:00PM

Re: 3dDeconvolve, concatenating runs with different baselines

Gang Chen May 19, 2005 02:00PM

Re: 3dDeconvolve, concatenating runs with different baselines

Kara May 19, 2005 02:45PM

Re: 3dDeconvolve, concatenating runs with different baselines

Gang Chen May 19, 2005 04:06PM

Re: 3dDeconvolve, concatenating runs with different baselines

Kara May 19, 2005 05:50PM

Re: 3dDeconvolve, concatenating runs with different baselines

Gang Chen May 19, 2005 06:24PM

Re: 3dDeconvolve, concatenating runs with different baselines

Kara May 19, 2005 06:48PM

Re: 3dDeconvolve, concatenating runs with different baselines

Gang Chen May 19, 2005 07:04PM