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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nic
July 30, 2014 07:31PM
​Hi Rick,

Thanks again! The info on TENTzero was very helpful!

I had run the analysis using TENT(12.5,42.5,7), which looks very good. Another option I considered was TENT(10,45,8) but I don't think I'm really gaining anything (probably rather the opposite).

Things I may have not appropriately considered:
- There is not much of "rest" left
- There are 6 "stimuli" (i.e. 6 bh blocks), each "stimulus" modeled with 7 tents bc I thought sampling every other TR would be sensible with respect to DOF etc

Scaling is done on a voxel-wise basis (in those of significant checkerboard-related activity):
scaled checkerboard beta = checkerboard beta / (1+ bh beta / avg bh beta across all voxels in the mask)

I had planned on using an average (across all tents) of the reml or iresp betas to be used as the voxel-wise bh beta in the scaling function though your post suggests that this may not be the way to go? If I understand you correctly, then averaging across betas 2-4 or 1-4 (out of 0-6) from the reml output would be reasonable?

Does it make sense to consider the iresp in favor of the reml betas to be used in the scaling operation?

Thank you!

Nic

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The task consists of 6 bh blocks each 15 sec and 6 rest blocks each 30 sec (I said 27 in an older post). The bh blocks have a 3 sec countdown before them.
Subject Author Posted

Re: Question about TENT/SPLIN - number of parameters

nic July 21, 2014 05:40PM

Re: Question about TENT/SPLIN - number of parameters

rick reynolds July 23, 2014 09:54AM

Re: Question about TENT/SPLIN - number of parameters

nic July 23, 2014 06:42PM

Re: Question about TENT/SPLIN - number of parameters

rick reynolds July 24, 2014 04:36PM

Re: Question about TENT/SPLIN - number of parameters

nic July 30, 2014 07:31PM

Re: Question about TENT/SPLIN - number of parameters

nic July 30, 2014 08:58PM

Re: Question about TENT/SPLIN - number of parameters

rick reynolds July 31, 2014 12:38PM

Re: Question about TENT/SPLIN - number of parameters

nic August 10, 2014 07:06PM