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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Zhang Yu
January 10, 2018 01:24PM
Hi Bob,
I am very very appreciated for what you did！

I don't know how these parameters of the two gamma function specified in SPM or BrainVoyager, so I have some more questions:
1) Is the variant d the time duration of stimuli or not? If each event lasts 2s in my event-related experiment, the d should be set to 2?
2) To set these parameters of TWOGAMpw correctly, the signal change of my data is calculated firstly. I find the averaged signal change has a positive peak at the 4th second from stimuli onset and the width corresponding to this peak is 10s (from 0s to 10s from the stimuli onset). The averaged signal change also have a undershoot with a peak at the 12th second from stimuli onset and width of 4s (from 10s to 14s from stimuli onset) not including the part shared with the first peak.
So the TWOGAMpw could be set like this:TWOGAMpw(4,5,r,12,7,2)?
3) How to calculate the r of the undershoot from the signal change?


Thank you very much again!
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Subject Author Posted

How to use HRF with shorter latency for deconvolving in afni?

Zhang Yu January 04, 2018 04:15PM

Re: How to use HRF with shorter latency for deconvolving in afni?

Bob Cox January 05, 2018 11:50AM

Re: How to use HRF with shorter latency for deconvolving in afni?

Bob Cox January 08, 2018 11:01AM

Re: How to use HRF with shorter latency for deconvolving in afni?

Zhang Yu January 10, 2018 01:24PM

Re: How to use HRF with shorter latency for deconvolving in afni?

Bob Cox January 10, 2018 01:41PM

Re: How to use HRF with shorter latency for deconvolving in afni?

Zhang Yu January 11, 2018 01:21AM

Re: How to use HRF with shorter latency for deconvolving in afni?

rick reynolds January 11, 2018 08:52AM

Re: How to use HRF with shorter latency for deconvolving in afni?

rick reynolds January 11, 2018 09:52AM