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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Liu Mengxing
March 28, 2019 07:26AM
Dear afni,

I'm doing gPPI by following the pipline here: [afni.nimh.nih.gov]

In the cmd.ppi.2.make.regs part to make the regressors,there is one step generating the ideal IRF (starting from line 66) . There are two options in the demenstration, one using GAM and one BLOCK, with different durations.

My stimuli have varying durations, so when I do GLM, I used combination of -stim_times_AM1 and dmBLOCK. In the PPI it is said the basis function should be consistent across classes, so I suppose I should use dmBLOCK to generate an ideal IRF? But what duration should I use? Each block has different durations, from 15s -22s.

Thanks!

Meng



Edited 1 time(s). Last edit at 03/28/2019 07:26AM by Liu Mengxing.
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Subject Author Posted

generate ideal IRF in gPPI with dmBLOCK

Liu Mengxing March 28, 2019 07:26AM

Re: generate ideal IRF in gPPI with dmBLOCK

Liu Mengxing April 02, 2019 04:50AM

Re: generate ideal IRF in gPPI with dmBLOCK

rick reynolds April 02, 2019 09:12AM