Dear Mark,
> Back in September there was some talk of Karl's spm_regions routine and
> it's extraction of eigenvariates from a region of activation which can
> then be fed back in to SPM as a covariate of interest. I have used
> this method to generate some nice results in a PET study. Is the
> rationale behind this method published anywhere that I can cite to back
> up my use of this method? Any references would be appreciated.
You could try
Friston KJ Buchel C Fink GR Morris J Rolls E Dolan RJ Psychophysiological
and modulatory interactions in neuroimaging NeuroImage 1997;6:218-229
although I think the spm_regions/eigenvariate approach was first
described in one of Christian's effective connecivity papers.
I heop this helps - Karl
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