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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Akiko Ikkai
March 20, 2009 02:02PM
Hi Gang,

I picked 1 voxel from anterior intraparietal sulcus (IPS), which we usually see strong modulation with task-covariates. "Coef" (I'm assuming this is "beta") and "Tstat" from decon_results+orig (output file of 3dDecon) for this voxel during one type of trial are: (time points 0-9)

Coef Tstat
-0.1947 -0.1641
-0.0314 -0.2652
0.2725 2.2806
0.3893 3.2582
0.1590 1.3242
-0.1989 -1.6512
-0.2729 -2.2698
-0.3023 -2.5223
-0.2204 -1.8550
-0.1105 -0.9183

and SD is 0.118 across the time-series. There are 26 trials in this trial type, which makes SEM = 0.118/sqrt(26) = 0.0236. This is almost 1/5 ~ 1/10 of SEM that I'm used to seeing with trial-averaged time-series. Are SEM calculations for decon and trial-average different?

Thanks for your inputs! Akiko
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Subject Author Posted

SD with 3dDecon

Akiko Ikkai March 19, 2009 05:10PM

Re: SD with 3dDecon

Gang Chen March 20, 2009 10:22AM

Re: SD with 3dDecon

Akiko Ikkai March 20, 2009 02:02PM

Re: SD with 3dDecon

Gang Chen March 20, 2009 03:47AM

Re: SD with 3dDecon

Akiko Ikkai March 25, 2009 07:27PM

Re: SD with 3dDecon

Gang Chen March 26, 2009 10:53AM