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
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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.
Is this an event-related experiment? Are the fixation time points those TR's when the subject is not asked to perform a task? If so, you don't need to explicitly model those fixation time points since they are handled by the polynomials through "-polort 3" in your script, and all the results can be automatically interpreted as a contrast against the fixation.