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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Francisco Pereira
April 24, 2008 06:37PM
Dear AFNI users,

I'd like to model data from a slow event-related study where there are
trials belonging to one of five conditions. All the trials last three TRs (2.5 sec each)
with stimuli shown for 2 TRs and a response taking place in TR 3.

The two questions I have are:
- should the response be modelled as
- just one extra TR of the condition of the trial preceding it
- as a condition on its own
- if modelled as its own condition and I don't care about it,
should it be included as a -stim_base regressor (much as one
might include the motion correction parameters) or is
that inappropriate, given that it always follows task performance?

I've read the manual and several posts regarding the use of 3dDeconvolve
and couldn't find an answer to this particular question, so any light
you might shed on this is very welcome and much appreciated!

Francisco

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Subject Author Posted

3dDeconvolve and -stim_base

Francisco Pereira April 24, 2008 06:37PM

Re: 3dDeconvolve and -stim_base

ziad April 25, 2008 01:40PM

Re: 3dDeconvolve and -stim_base

Francisco Pereira April 25, 2008 01:57PM

Re: 3dDeconvolve and -stim_base

ziad April 25, 2008 02:08PM