Dear Laura,
> could someone clarify for me what the betas produced using time and
> dispersion derivatives are? Is it that the first is canonical only, the
> second is canonical+time, and the third is canonical+time+dispersion, OR is
> it canonical only, time only, and dispersion only?
It's the latter—canonical only, time only, and dispersion only. When
you estimate a model in SPM, the beta reflects the contribution of
that model in your design matrix: beta_0001 is the first column,
beta_0002 the second column, etc.
Hope this helps!
Best regards,
Jonathan
--
Dr. Jonathan Peelle
Center for Cognitive Neuroscience and
Department of Neurology
University of Pennsylvania
3 West Gates
3400 Spruce Street
Philadelphia, PA 19104
USA
http://jonathanpeelle.net/
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