Dear John,
> Suppose, my trial duration is 4 seconds and the TR=2.5 seconds. How bad is
> it that some of my trials starts at the middle of a TR? Clearly, the SPM
> onset matrix can coop with it, but how bad it is from model estimation point
> of view?
That's not bad at all—as long as the trial onsets are specified
correctly, there is no downside to this. In fact, you actually may
aid the efficiency of your response estimation because you end up
sampling the response at different times this way.
Hope this helps!
Best regards,
Jonathan
--
Dr. Jonathan Peelle
Department of Neurology
University of Pennsylvania
3 West Gates
3400 Spruce Street
Philadelphia, PA 19104
USA
http://jonathanpeelle.net/
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