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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gang
April 02, 2015 11:46AM
Hi Dominic,

> how does AFNI know how long each stimulus should be modeled for if only the onsets are required for
> the stimulus timing files when using something like SPMG2 or GAM?

If your stimuli just last for 2s, you can essentially treat them instantaneous events (event-related design), and it is good enough to simply provide the stimulus timings without worrying about the duration. In other words, the duration of 2s is not important. On the other hand, if the stimulus duration is long enough (e.g., longer than 2s), you can use the counterpart of GAM, BLOCK(d,1), to specify the duration d. Similarly SPMG3(10) means a stimulus duration of 10s for the SPMG3 basis functions.

Gang
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Subject Author Posted

Modeling Event Related Design

dsf215 March 19, 2015 04:02PM

Re: Modeling Event Related Design

gang March 19, 2015 05:15PM

Re: Modeling Event Related Design

dsf215 March 20, 2015 12:13PM

Re: Modeling Event Related Design

gang March 20, 2015 04:44PM

Re: Modeling Event Related Design

dsf215 April 01, 2015 03:55PM

Re: Modeling Event Related Design

gang April 02, 2015 11:46AM